My wife had her water break and my first child was on his way.
Are you excited about the baby?
I don't like the idea of becoming a father and leaving my girlfriend
It seems that you are not prioritizing your responsibilities. You should be there to support your wife and your newborn. You should not want to spend time with a girlfriend while your child is being born.
I only want to do what I want to do.
You're married with a child. How will doing only what you're in the mood for make you happy? Your wife and child need you now; imagine how you'd feel if your father treated your mother and you that way.