Hey toxik, I used to worry about this alot too and for good reason, im alot younger than you. I started lifting when I was 14 for hockey, but I was reluctant because my oldest brother had always told me about people he knew in highschool who were runts because they started lifting too early. Most people in athletics I could talk to at my school said that it wouldn't, but I should stick with med-high reps so that I didn't injure myself. Then I started to see an endocronologist (A person who deals with growth, and hormones and stuff) and he said theres nothing wrong at all with weightlifting.
The only theory I've heard that makes sense is, when you lift real heavy ie. 1-3 reps, it can damage your joints and caralige, which takes your body more time you repair instead of spending its time making you grow.
Another thing is, I started going to this guy when I was about 11. He took this thing called like a "bone culture" or something, some X-ray of my wrist bone. They can tell from your wrist bone how tall you have the potential to be. He said id probably be 5'9-5'10. At the time I was 5'3, now im almost 5'7, and I think i've grown the most after I started lifting.
Anyhow, I wouldn't worry about it, especially if you started at that age. Most people who are incharge or adolesent or kid lifting programs advise that you start after 13-14, so if you started when you were 17 id say your in the clear.
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