It sounds like this is really stressing you out! If it helps to know, people don't hit the exact same stage of puberty at the exact same age, so sometimes a certain part of it (like first ejaculation) comes a little later for you than it does for your peers. But there's no reason to assume you'll never be able to ejaculate.
Too, if you've been masturbating and are stressing out about whether or not you're going to ejaculate, that can actually make ejaculation less likely, because pressure or stress is a big-time arousal killer. Does that all make sense?