Are you PAINFULLY INSECURE like me?

Em sorta goin thru d same thing bt em sixteen..i cnt carry on a conversation with sum 1 face to face without wondering how my face looks..i cnt go out without wering some long shirt or blouse tp hide my butt..n all the time i hve to pull it down cauz i thnk ppl cn c my big butt....i cnt stop thnkin wt ppl r thinking wen i pass them or sit indront of 'em..i feel like a weirdo n i need help too:((