I realize that my explanations supporting hedonism were very long. They are so long that people don't even bother with them. Therefore, here is a summary I have finally come up with that also explains some more things as well:
Many people say that even without our feelings of pleasure, that there is a form of joy, happiness, and pleasure we can have in our lives. But this is false. Different functions of our brains are completely different experiences. If we had no feelings of pleasure, then the function (experience) of all our thoughts would all just be the "thinking" experience. We cannot experience any form of pleasure or happiness from our thoughts and other things alone without our actual feelings of pleasure. To say that we can would be no different than saying that a blind or deaf person can experience sight or hearing from his/her thoughts alone without his/her actual sight or hearing.
We could very well personally define what pleasure is in our lives even without our actual feelings of pleasure. We could say that our thoughts and other things in our lives are pleasure just as we could say that our thoughts and other things in life are a form of hearing or sight without our actual hearing or sight. But that still doesn't change what our thoughts are. That still doesn't change the experience of our thoughts in that they are all the "thinking" experience of our brains and can't be the experience of sight, hearing, pleasure, smell, etc. Same thing if we personally defined our own happiness and joy in life without our feelings of pleasure. That personal defined happiness and joy is not going to change the "thinking" experience of our thoughts. This "thinking" experience cannot be any other experience as I've said before and it can't be any experience of pleasure, happiness, peace, or joy. As I said before, it is all nothing more than the experience of a thought of pleasure, joy, and happiness and not the actual experience of any pleasure, joy, and happiness without our actual feelings of those things. Even if we somehow could experience pleasure or suffering from our thoughts and everything else in life, then that could only be providing we have our feelings of pleasure and suffering to do so.
Our moral values and other profound personal meanings in life also can never change the experience of our thoughts without our feelings of pleasure. Pleasure, joy, happiness, misery, suffering are all scientific and can only be defined as the areas of the brain that experience actual feelings of those said things.
Now other things in life can very well have good or bad value. If you hurt someone or an innocent living creature, then that could very well be said to be something bad. If you help others and living creatures, then that could very well be said to be something good. However, there is another version of good and bad. This other version of good would be the version of good that comes from us being motivated, inspired, looking foward in life, having a sense of joy, etc (aka, having a sense of worth in life and life being worth living to you). This version of good is our own personal lives and this version of good can only come through having our feelings of pleasure. Without your feelings of pleasure, then you could still live for other good things in life anyway. But there would be no motivation, drive, inspiration, joy, pleasure, peace, or happiness. It would be nothing more than you just simply choosing your thoughts and actions and all that would be experienced here would be just thoughts and such. Therefore, that version of personal good in our lives I just mentioned would not exist without our feelings of pleasure, joy, motivation, etc. Same thing applies for bad in that, without our feelings of suffering, then our personal lives can never be bad. Without feelings of pleasure and suffering, then our lives would be neutral (neither good or bad).
Our own conscious is what defines our own personal lives since it is our conscious that makes us alive in the first place. Therefore, if we had no feelings of pleasure, then us living for other good things in life separate from our own conscious would not define our personal lives as anything good. In other words, we could live for other good people and bring them joy and pleasure. But that wouldn't make our own personal lives anything good without our own feelings of joy and pleasure. Therefore, the version of good and bad of our own personal lives can only be defined through our own feelings of pleasure and suffering. Just because we derive pleasure and suffering from witnessing others experiencing pleasure and suffering does not mean that we are experiencing their feelings of pleasure or suffering. We are only in our own minds and we can only experience our own feelings of pleasure and suffering. Therefore, this is the reason why only our own feelings of pleasure and suffering can define our own lives as good (pleasure) or bad (suffering) and nothing else.
One might ask me where is my scientific evidence supporting my claims here. The answer to that would be that this doesn't need any evidence. It is a basic scientific fact in of itself. To ask me for evidence of it would be no different than you asking me for evidence that our hearts pump to keep us alive. These are all things we already know. Just think for yourself here for once. How is it scientifically possible for a person with anhedonia (absence of pleasure) to somehow create new neurons and connections in such a way that his/her thoughts of pleasure become neurons and connections that experience pleasure and joy? This would be no different than me asking how is it scientifically possible for someone who is blind and deaf to create new neurons and connections in such a way that his/her thoughts of hearing and seeing actually become neurons and connections that allow him/her to see and hear.
Therefore, who the hell has ever taught you that we can have a form of pleasure, joy, and happiness in our lives without our feelings of pleasure? That an anhedonic person such as myself can have a form of pleasure in my life without my feelings of pleasure? These people who have taught you this are clearly speaking nonsense and are deluded.
Now I don't know of any evidence I can find (other than what I already stated which appears as an actual scientific fact in of itself). However, if, let's pretend, that you knew how the brain works and was some highly intelligent neurologist, then I think you could then conclude whether what I just said was a scientific fact or was nonsense. Therefore, do not ask me for evidence. Instead, go ask an intelligent scientist or neurologist and get their word.
But even if it were somehow proven to me that our personal lives can be good and that we can have a genuine form of pleasure and drive in our lives without our actual feelings of pleasure, my feelings of pleasure to me personally are what I need in my life and define my personal life as good and that does not make me selfish or a narcissist for having that value.