I'm sorry that you're feeling like this and that I don't really know what to say . . .

Why do you think you deserve to suffer and feel that you're less important than others?

From what you've written it appears that you really are important to others, as you've said that people would be hurt if you "did something stupid".

Also, you want out, but you don't want to hurt others, so there must be people who you care about and who care about you.

It sounds like there might be someone you could ask for help. I hope you're able to.