I once stole someone's project and claimed it as my own
Can you explain why you stole someone's project?
It made me feel good inside to take credit away from him for once.
While it may have felt good for you to steal that project, you most likely really hurt him a lot. Would you like it if someone took credit for your work?
It's my right to take credit for other people's work.
I understand that in the moment this feels good, but I've heard that doing things like that can come with very serious repercussions. You should consider giving it back.