Always sad

It's not a new thing, I just always felt this way. I am sad over everything. Sad because I can't do something right, sad because I'm not busy, sad because I'm too busy. Mostly, I'm sad because I don't feel for others. Like I don't like seeing people sad and I care about their well-being, but I don't think I ever truly loved someone. I don't have a relationship with my parents and I push people away. It might be because I don't want to get hurt but all I do is hurt myself. I want things to end but I don't have the strength to do anything.