In every way my friends seem so much better than me and that makes me hate hanging out with them.
Specifically, what makes you think your friends are better than you?
When I hang out with them, I feel so inferior. They are all rich and very successful.
I understand how you're feeling, but it's not good to feel envious towards your friends. You should be happy for your friends if they're doing well and try to support them.
I know that, but it makes me sad to see how successful they are.
I understand your frustration, but comparing yourself to others, even your own friends, is not a good thing to do. It leads to jealousy issues and unrealistic expectations of oneself. You are your own person, allow yourself to be that.