potty hell

Clearly he is not ready to potty train. I thought we'd try wearing underwear all afternoon so he learns what it feels like to be wet. Yeah, not a great idea. Two loads of laundry and some carpet cleaning later, we have conceded that he is not physically ready. He was wetting himself every 15 minutes. I suppose he just does not have the bladder control to hold it. I plan to ask his doctor about this at the three year checkup. I'd like to think that there's nothing actually wrong with him, that he will learn to use the toilet before he graduates from high school. I feel so frustrated, and I don't want to let him know that I feel that way. He told me "I will NOT use the potty" and I was so angry by his flat out backtalk (something new this week) that I had to take a minute to gather myself. He finally told me "I am a baby, not a big boy--babies wear diapers". We're going to give it a rest for a few weeks. But we're still going to talk about how good it is to use the potty! I'm open to tips from experienced potty training!