You are still a kid, and there is a lot more growing yet to do (in so many ways!!). You need to give yourself a lot more time.
Each of us mature at a different rate, and in different ways. You cannot compare yourself to anyone else. You are unique. You have different parents than all of us, and you will develop in your own special unique way. Don't rush it!! It will all come, in it's own way, at the right time. Until then, just have fun being a kid! This time will never ever come again. Ever!