Hair growth?

About three weeks ago I went to go get a haircut and it turned out horrible I MEAN HORRIBLE! im completely embarrassed by it and wont be going to that person again, but is there any ways y'all get yalls hair to grow, she cut off literally all my dead ends so thats the good part! But please share yalls stories I tried taking prenatal vitamins because I heard that works wonders for hair, nothing has happen.. But please share?