I've been catfishing other people for years
Really? Why have you been catfishing for years?
It's just a hobby for me, I enjoy it when people fall in love with me.
Catfishing others is wrong. You are leading them to believe you are someone you are not.
They are hurting themselves by being so gullible. It's not my problem
You are the one creating the problem by lying to others and making them believe you are really interested in them. People who have been treated this way have trouble getting over the trust issues it creates. I think you should really think about not doing this anymore.