My feet are still growing?

Why is that my height doesn't increase anymore (Stuck at 5'11"), but my stupid feet apparently are still growing? I bought some size 11 shoes yesterday without trying them on, and then went to a restaurant with them. I had to slip them off under the table, because they were too tight and very uncomfortable. I went back and got size 13 and that was much better.
I've never gone higher than 11 and Cathi is laughing at my "clown shoes" look. Why is it that my feet are still growing? Why can't I get taller so it seems more natural!