I am 12 and I want to wear hijab, but don't have the confidence because I am scared that none of my friends will still like me. What should I do?

If you really want to wear the headscarf, please go for it. It is great you want to wear it! Remember why you are covering yourself, for the sake of Allah, not your friends. A true friend will accept and support you for it. Also, it is important to note that hijab is not just a headscarf. Wearing loose clothes, covering arms and legs, and covering your head and neck are all the parts of the hijab in Islam. Allah will reward you tremendously for your confidence at such a young age, and if your friends turn against you, then leave them, because they are not true friends. It has nothing to do with you. If you still don't have the confidence, you are still young and Allah will still love you.