hey cantstopcrying, I think all the responses here are really good, I agree with them all. The only thing I wanted to add, is that it seems like there's a lot of pressure for you to be a people person. And that you might be feeling that there is something wrong with you because you tend to want to be alone most of the time/shy from large social situations.
I just wanted to say, nothing is wrong with you because of that. That's the way you are, and you shouldn't be ashamed of that.
Just realize that for your job, you have to do something a little unnatural for you. But again, that doesn't make you a bad person because of it, it's not like you fail fail fail. You just win at different things.

Everyone has their strengths and weaknesses - this is only a weakness, not a failure or something that makes you any less than anyone else