Why Can Not I Ejaculate?

Hi, I'm embarrassed to ask this, but here it goes, I am 16 (17 in 2 months) and male, but cannot ejaculate. My doctor didn't seemed concerned with the size of my testicles but he doesn't know that I can't ejaculate. When I turned 14, my doctor said that I was a year or two late but this seems like more. I have plenty of hair and I am able to get erections. I don't know if this is related, but I have a mild form of hypospadias that was determined to be not enough of a problem to operate on. As for the question, am I just late, or could something wrong? I am 5'9, 140 pounds, and of european decent. I know that it is hard to give advice without seeing me, but nonetheless thank you.