My friends are becoming a burden. I’m stressed because I end up getting treated like I'm bad. I am tired of caring about everyone's feelings. How do I deal with this stress so that I can care less about them and be self-centered without hurting them?

As a giver you fall into the bracket of being taken for granted, people are actually not used to that extra caring which you are offering them for free and without asking I suppose. Your friends are judging you wrongly it's not your fault; change the set if possible? learn to take your stand, don't be too available, learn to say no upfront if you mean it. Get into a new group because your image here will stay for a while. Just move.