Not to sound harsh or offensive. I can't change. I am who I am.
Rubbish - you change almost every day of your life. Everytime you learn anything (whether knowledge or a skill) you change. Every time your awareness grows, you change. Every time you pick up a new habit, you change. Everytime you find a new like or dislike, you change. Change is what powers our life, and benefits all our future endeavours.
Did you know you can learn to make fun of yourself - most consider that a wonderful personality change. Did you know you can learn to persuade / influence people - most consider that a charismatic personality change. Did you know you can learn to tell stories really well - most consider that a light hearted and good natured change. etc.
And I always make an effort of trying to make friends. But somehow I can't really get closer to them.
Are you aware that we have multiple competing sections of our brain? ie. The brain isn't one big cohesive organ - it actually has several sub-organs within it. I don't recall the actual names for the different parts, but our instinct section is found in the rear bottom of the brain, the emotional part is on top of that, the logical part is right at the top, and there's a few other parts too, but our instincts, emotions, and logic all compete to reach a decision...hence we can often be in conflict with ourselves.
I consider it vital that we understand this when we are struggling with conflicting interests.
If a part of you truly wants to be friends, and you aren't developing friendships, it's because another part of you is subconsciously working against this. This causes great problems in our lives...and conversely, once we bring ourselves into alignment, we seem to almost effortlessly achieve the things we want.
A large part of your current problems will be unconscious habits that you have developed which are designed to push people away. You don't 'stop old habits', but rather, you replace old habits with new habits.
If I may suggest - stand in front of a mirror, and think about an interaction with someone that made you uncomfortable. Pinpoint the time when you became uncomfortable, clearly recall how you felt...and only once you can recall what you felt, repeat the words you said, and watch your facial reactions.
Then try doing the same for something that only made you mildly uncomfortable, and watch your facial reactions.
When the new way of behaving becomes subconsciously acquired...you will then find yourself easily slipping into the habit of friendly warmth. (the new habits of course, may take a while to be acquired subconsciously - but the results are valuable, and will be a powerful force within you, helping you achieve)
I ended VERY used to being alone that I find it weird that people try to be nice to me. (Which is true. I sometimes make a weird face at someone if they try to get my attention in a friendly tone. Even one of my classmates.
One of these instances would be good for the above exercise.
After you've done this...you can practice in front of the mirror, responding in a friendly, warm tone, with open (ie friendly) body language, while looking them directly in the eye and smiling.
practice that several times.
And every time you experience a relapse, stand in front of the mirror and practice several times a warm, friendly response.
Doing so says to your subconcsious that 'this is the way I want to be'.
Don't forget though that you are fighting years of ingrained habit, and deeper fears that you haven't yet confronted and soothed away. So it will take time, and you will have relapses (probably plenty of them). Just face it knowing you will get better and better at being warm and friendly.
And it kinda lasted through high school. It was hard for me to make close friends. I can make friends but I can't really "keep" them. I maybe creep them out or hurt them.
And this is the reason why I became so unsociable.
So you reject them, leading to them rejecting you – leading to you to move distancing yourself from other people who you might reject (which would lead them to reject you)...is that right?
Or the short form...you reject them...and because of their negative reaction to you rejecting them (what a surprise), you then choose to be unsociable?
If you are looking to be friendlier (and therefore obtain more friends) - you need to be aware of this cycle you created.
I even acted like I was interested in what they do and such. But after a while I don't really find myself hanging out with them. And they end up thinking I'm being to proud or something. Or that I really don't like them. But the truth is that I'm okay with them.
The red part is just one truth. As I mentioned earlier - we can have competing interests within ourselves. There is another truth in you that they are seeing. Whether its that you are too proud, or some other 'truth' is something for you to find the answer to.
And I don't think a doctor would help. I understand myself all to well.
You don't need a doctor, but a psychologist would probably be rather beneficial to you.
Short of that - start training yourself to be warm, friendly, with friendly eyes and an easy smile. Train yourself to open up your body language and let people in. It's quite possible. It takes a short time for some, and a long time for others. But for everyone, it's very worthwhile.