stop caring about what people who don't care about me, care to think

I think I’m oversensitive to criticism and when someone comes to me and say something that is totally untrue I guess I still feel hurt, even though that person doesn’t know me at all.
I know I have to care about what people that know me say,and not the ones who don’t know me; because they are the ones who know me,and want the best for me.
Everyday job.

I find myself not doing things i want to do for fear a handful of people might make fun of me or hate me for it. But really how bad is that? it’s actually kind of funny. The people i can see putting me down are gross anyways. so i might as well get on with it.