Hi, Sad Panda.

I can identify with a lot of what you're saying. I do the same thing in waiting rooms too, though usually I'll just reach for a magazine and try to act casual and pretend I'm not shaking

. I do it more just to have something to do instead of sit there awkwardly than because I actually want to read. I tend to try to avoid other people's gazes. Although I don't really feel like people stare at me, I tend to think I'm pretty boring looking. xD But it always makes me kind of uncomfortable when I find someone is looking at me, because I can't help but wonder what they think of me. I try to tell myself it doesn't matter and I shouldn't worry about it so much, and that most of these people probably have a lot better things to think about, but it's still hard not to do.
It has gotten a lot better than it used to be though. I used to be a lot like you as far as the identity issues go as well. It wasn't until I came out to myself that I had started to get a better grasp of who I am, but I still struggle with it at times. For a long time I felt like I didn't have a personality as well, and as a result was the most boring person in the world. That's gotten better too, but I still worry sometimes that I annoy people with how shy I am.

I used to mimic people a lot. I would act differently depending on who I was hanging out with, try to act more like them, so I would fit in better I guess. I'd also act towards people the way I thought they wanted or expected me to act, instead of just being myself. I felt like I had to fit into people's expectations of me and was afraid of letting people down. Now I realize that's really kind of silly, because you can never know what people really think of you. But I didn't have an identity to assert back then. I still pick up on things other people do here and there, but we all do that, so there's nothing abnormal about it. Now I just try to relax and do and say what I feel like without worrying about it too much. That's something I'm still working on too, but I'm a lot better at it now than I used to be.
Over-stimulation is a big issue for me as well. It happens to me very easily it seems. Whenever there's a lot going on, especially if I have to talk to a lot of people, I can get really overwhelmed. I wind up wanting to just stay in my room where I can be by myself in silence with nothing going on. Sometimes I have days where I wished I could just move out into the woods away from human beings just so I didn't have to deal with the anxiety, but I don't want to do that. I'm the same way, I don't want to be a loner, but sometimes it feels like I'm doomed to be one because I can't handle people. I only have a small circle of friends and family that I actually feel comfortable talking to, but even so, there are some days I just don't want to talk to anyone at all.
Sometimes it seems like a part of me does feel like there's something innately wrong with my very existence. It's not a good feeling, I know. This mode of thinking used to be a the very forefront in my mind, but over the past year or so, I've managed to curve myself away from that kind of inner dialogue, but it still creeps up now and then.
I know it's not easy, and at times it seems downright impossible, but you can get away from this mode of thought by consciously working to change your thought process. Your therapist should be able to tell you more about how to do that.
But above all else, you need to know that there is nothing wrong with you, Sad Panda.

I know it can be hard to believe, because I know where you're coming from, but it's absolutely true. You have every right to be in this world as anyone else does, as well as to be and act and look any way you want to. Everyone you come across will have a different view of you, and you won't have any idea what it is, so just concentrate on being the person YOU want to be, in the way that makes YOU feel relaxed and comfortable and happy. Don't get me wrong, I know it will take some work to get to that place and it's not as instant as just saying it, but I know you can do it.

Just try to have confidence, and keep telling yourself you are worthy and you are enough. You are not repulsive or horrible, and your existence is most definitely not offensive. I'm sure anyone who knows and cares about you will tell you you bring a lot of good into the world, and theirs wouldn't be the same without you.
You will figure things out, just give yourself some time and permission to do what's best for yourself.

You deserve to be happy just as much as anyone else does.