It's more than likely that you have a physical problem in that area. Go to the doctors and get checked out.
Whether you can ejaculate and how much isn't dependent on when you hit puberty. It could be a developmental problem in the testes or even a problem with the prostate. Please get it checked by a doctor!
Do not be ashamed, if us women can spread our legs once a year to get checked so can you!
i don't know what to say.. id get that checked out man.. thats gonna have some longterm effects