I'm thinking of keeping my tip money
Do you think that's fair to your friends? I remember last time you mentioned owing them some of that money.
They were being unfair to me because I entered this profession.
If you have earned that money through tips, then it is yours to keep, but you also have an obligation to pay what you owe to your friends, regardless of how they have treated you lately. If you do not want to share your tips in the future, then you need to be clear with your friends, and to not make any further promises to them.
I really don't feel like it, I'll pay them later.
Well, I'm glad that you are taking responsibility for your debts. Your friends do need to treat you with more respect, but you still need to pay what you owe.