What's wrong with my brother?

He's probably really regretful of the decisions he has made and too depressed about it to do anything with his life. He just needs motivation. Maybe a heart to heart would work? Tell him about how much you care about him and how when you were little he was such a great role model. (Say this gently because it'll probably be a pretty sensitive topic) you miss that part of him, that part that you know is still inside him somewhere. He needs to be motivated to do something. With his life.he needs to be told how important he is to you and how much you really want to see him succeed. Be honest and sensitive...tell him that if he wants you to help him you're there for him always. Hopefully things will work out and he will realize that he needs to do something with his life to bet the brother he once was

Try to talk to him. He must have something bugging him if he's always talking about the past. I don't think he has a disorder though.

Tell him to try and apply for a job or he won't get anywhere In life and If he says "No" Then he might be lazy, Hope I helped

Try to give him a friendly and brotherly lecture. Try to make him feel in this world as a brother to remember.