I have experience with taking the need to put others' mental health before my own to dangerous extremes before("nearly flunked school because I told myself playing therapist was more important than doing my homework/getting enough sleep to function" bad). Learning to stop feeling like I owed it to people to spend all my time trying to fix them when they weren't even trying to help themselves and when to step out and attend to my own life was the best thing that ever happened to me. You have no reason to feel bad.