When am I gonna finish puberty?
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Nobody can predict that for you. Check out all the other threads on puberty in this forum.
Based on what you described, you sound almost done with puberty, although most guys don't finish until about 17. Everyone goes through puberty differently, but I can tell you you are way more developed at 15 than I was at 15. At that age, I just got my first ejaculation, my armpit hair was just starting to come in and was barely noticeable, I had very little leg hair, my voice just started to crack, I was only 5'4, and my penis was only about 5" long. Things changed quickly from there though. Your height and penis size are already at or slightly larger than the average ADULT male, and given how much pubic, body, and armpit hair you have, that's why I say you're probably almost done with puberty.