Struggling with confidence!!!?

I'm 14 and a freshman....i been struggling with confidence...it seems like everything i do dont go my way, like everything i do it seems like i have bad luck...i try everything to have confidence but i can't find nothing...i worry a lot and think way to much...i also have negative thoughts...im always lost it seems like and people calls me dingy! i just wish i could be myself and dont worry but i cant...someone please please help me!