If I'm not mistaken, developing pubic hair is one of the first major signs of entering puberty, so you may have a while to go yet. However, these things don't always happen according to a set timescale, so I wouldn't take the appearance of pubic hair as a reliable indicator of your ability to ejaculate, or the time left before you do start ejaculating. I seem to remember having hair down there for a couple of years before I first started to come when masturbating.
Just relax about the whole thing... When your body's good and ready, you'll know all about it. Enjoy being able to orgasm without making a mess!