Hi I'm 11 and I have seen lots of other boys in my classes being really tall and I'm like tiny compare to my best friend and he is about a head size above me and I'm kind of starting to get worried please help thanks :p

Children grow at different times, many don't start larger growth till even 14 or 15. Also some boys are always just taller than others. No one knows when and how much you or anyone will grow. Boys continue to grow, at times a lot till 16 and 17 and then still grow some after that