when i masturbate I can't ejaculate. is something wrong with me?

It is not unusual for boy's of your age to not ejaculate when they masturbate. Your body is only just entering into puberty and it can take sometime before your sexual functions develop enough to produce semen and allow you to ejaculate. Don't stress and just enjoy the pleasure of masturbation without the need to clean up the sticky wet mess :)

Ahhh yes, those dry years were great. Then somewhere between 14 and 15 it became messy.