How do I get over anger toward an emotionally vacant father?

I say contact him. It sounds like you want to have a relationship with your father. Perhaps you could write him a letter? Explain that you'd like to have a closer relationship with him. Tell him that you appreciate his financial support and that you intend to pay him back but you're having financial problems at the moment. Maybe you can arrange a time where you both could meet to talk? i wish you well. Good luck.