I'm hateful of all my friends with family financial support
Do you really mean what? Why do you hate your friends for that?
They are always showing off their mass amounts of wealth.
It is easy to get jealous when others have more money than us, but still, you should not hate your friends. Understand that your friends come from different backgrounds and will have different experiences than you.
It makes me feel like they're bad people when they show off all of this money that's not even theirs but their parents.
I understand that the gap can cause a lot of tension, but they are your friends, right? Friends are supposed to support each other, and they may might not realize they are hurting your feelings. How about talking to them and understand why they have been talking this way?