I think my teeth are ruining my life.
Why do you feel that your teeth are ruining your life?
I hear that teeth can heavily influence your beauty.
It makes sense to worry about your teeth, but you shouldn't let how your teeth look influence how you feel about your own beauty. You can be beautiful no matter what your teeth look like.
It's hard, people are so shallow and judgemental.
That's true, people are shallow. It's okay to be hurt by other people's opinions. But you should work on improving your own self-esteem so other people's opinions don't matter.