Don't worry, I'm 19 and 5'2'' tall. You're just 14, so I think you will grow up to 5'4'' or 5'5''. Who knows! I can say for sure you haven't finished to grow yet.
On bigger planes you shouldn't have any problems as they've got adjustable seats and adjustable pedals. On small planes like Cessnas e Pipers you may need a cushion or pillow.