Im tired of being the nice/good girl. how can i change a bit?

im always the nice girl, the funny one you find laughing but a girl who's self esteem is kinda low but you can never tell because i'm always laughing (most of the time i try to). like you ever heard "the girl who laughs the hardest, cries the most"? yeah it sounds like me lol im really friendly, i try not to be judgmental toward people, sometimes i am but i don't truly mean any harm in hurting anyone. im the girl who always gets looked over by guys, im the one who tries to help people and im always all ears when people want to talk to me but im tired of being that way....because it seems that's not what gets attention. not saying i want to be bada$$...but just like i want to change that a little bit....how can i change the "nice girl" thing a bit? i've never had a boyfriend yet or anything...im 16