How do I make him commit?

My boyfriend and I have been dating over 3 years now. We have a one year old son, house, car payments...it all. But I am ready for the commitment of getting married. He on the other hand says he wants to wait until he is done with school but that is another 5 years. I work and pay all the bills on my own while he goes to school full time. I don't think its asking to much for him to make a commitment since I am putting so into our future. I have done ultimatuims, I have even went as far as setting up a cute surprise and asking him myself!!! He shot me down and told me that he had to ask me because people wouldn't accept a woman asking a man. I could care less! I just want to settle down already.

Is it time for me to go or just hang around until whenever he feels like it? Please advise!!!