I'm a bad person and I need to accept that
What makes you think you are a bad person?
Because I don't help anyone ever.
Sometimes I can be really selfish, too. I'll go for weeks without thinking about another person, let alone helping someone. But that doesn't mean that we are bad all the time.  Just get out of yourself and show some concern to someone, and you will feel much better.
Nah, I'll just be a bad person. I can't make myself nice.
But you shouldn't feel that you are a bad person because of it.  If you are busy or otherwise unable to help, then that will pass.  When you are ready, you will feel better if you do something kind from time to time.