I would also like to add this one last point here which I think is important. I think some people out there might try to disprove my whole idea that my good feelings are the only source of real joy and value. They might ask me:
"If you were in a state of complete depression and/or anhedonia (absence of all good feelings) and I told you that there was an eternal blissful afterlife that you can have all to yourself within a few days, but the only way to obtain it was to live your life and compose, then would your life and composing have real joy, value, and worth? If it does, then that obviously says here that your life can have real joy, value, and worth even when you don't have your good feelings."
My reply to this would be that I would think that this eternal blissful afterlife is well worth obtaining, I would think that it has so much value to me, and I would be compelled to live my life and compose even during my state of depression/anhedonia, but that is, again, a mechanical version of value, worth, drive, etc.
It is not any real joy, value, drive, and worth in my life. Just because I have the ultimate and greatest life right there in front of me within my grasp does not change the fact that any thought of value, joy, and worth in my life is still a mechanical experience for me. Therefore, my life would still not have any real joy, value, and worth. Others would then reply back and say:
"Of course it's real joy and value. You are living your life and composing in order to obtain something you want. Living your life like that is the very definition of real joy, value, and worth in your life."
My reply to this would be that there is a big difference between living your life like a lifeless machine set in motion regardless of what your reason for living is whether it is to help your family or to obtain something you really want as opposed to living your life and your life having real joy, value, drive, and worth. Therefore, even though I was living my life and composing to obtain that eternal blissful afterlife I really wanted, I was still that lifeless machine which means that my life still did not have any real joy, value, and worth.