I used to be just like this. I really tried to fit in - trying to think of interesting topics and comments, and pressurising myself to joke all the time, which ended up making me stressed out all the time. Now, I try to concentrate on what I want more. I've realised that group situations are really stressful, and so try to limit them. I'm a lot less stressed than before... unfortunately also a lot further away from people :roll: . I'm sure this is a good thing though... now I can figure myself out and come back to those situations on my own terms.
What I'm saying really is that whilst stopping trying to impress people may not solve your problems, it's a good first step. I hope :wink: