Is Extreme Solitude Selfish

I have become increasingly withdrawn from people in the last few months and in doing so I have improved my physical health and acquired new hobbies of reading and piano, which I neglected for a long time. I’m in college now, but I was wrapped up in a materialistic/superficial mindset ever since middle school and I feel like I’m just starting to get to know myself again. So I feel good about these growing aspects of myself but am constantly plagued by guilt of questioning whether I’m an “evil” or bad person…I know these can be symptoms of depression. I don’t feel that I can handle having relationships right now because I don’t feel that I have anything to give anyone right now…Then I question myself and think maybe I’m just being selfish.  Truthfully, I want to be selfish… I just want all my time to myself so I can work on my hobbies and feel better about myself and then when I do talk to people I will feel comfortable because I have something to say.  I want to go to class, do my work, and then do whatever I want the rest of the time with no other socializing.  I just don’t believe I’m going to resolve my unhappiness outside of myself.  Yet I feel that I should be constantly trying to “help” or please someone and that I don’t deserve everything I have. What do you think I should do?