Is it actually possible to get over social anxiety?

[Christian]

You sound like you're a teenager or a very young person, in which case these thoughts and feelings are normal. As for being bullied, quite a few people in school are assholes who like to put people down.

As for your negative thinking, you need to remember that thinking negatively gets you nowhere. Look at it from a logical perspective. Being positive has better results than being negative, right? So you have more incentive to be a positive thinker. Everything has a good and bad aspect. Since focusing on the bad aspect does nothing, you should focus on the good aspect.

If you think it would help, I would speak to a school counselor or a therapist. Getting this stuff out in the open is a lot better for you than holding all of it in. Best of luck to you.