You could get taller. I grew more after the age 15 (i think). The only way to really tell is to be x-rayed. There are growth plates at the ends of bones. Doctors can look at them to see if they are done growing or not. They can also look at you hip bones and they grow in a way that shows if you are done growing risser sign i believe is what it is called.
I am actually 5' 9 1/5" also...lol. I couldnt imagine getting much taller! I already have to bend over to do everything, I imagine you know what I mean.
If you keep growing, and at a fast pace I would ask your doctor if it is abnormal. There are things that can make you keep growing like hormonal imbalances, and can be fixed with the right treatments. So just keep track of it for now, and if you feel like it isnt normal make sure you get to the doctor and they will make sure it isnt abnormal.
Try not to worry about it too much, enjoy being young while you still are. Stacey
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