Sorry, my bad. For girls it's the same except plates fuse between 16-19.
There is a (not very scientific) way of determining your adult height. Add your father's height in inches to your mother's. Divide by two. Girls subtract two and boys add two. It's not very reliable but it will give you a rough guess.
Thanks Paul, but Im a girl. I guess I shouldve made my username more feminine haha. my fault for not putting my gender. But being female doesnt change that much about what you said for boys does it?
Your growth plates fuse so slowly that you will not feel it. Boys usually fuse between 18 and 21 so I'm sure that's not it. If it makes you feel any better, I was 4'8 when I was 15 and am a 5'11 adult.