How can i beautify myself and be a new me.?

Hi, I want to be a new person when i start school again im 13 5/4 but i weigh around 150 lbs i dont wear makeup and we wear uniforms where i go to school i have light green eyes and sometimes blue eyes my hair is short what should i do to have people notce the diffrences hand a good way to lose lbs quickly i swim alot but my metabloism is so slow how can i make it faster and i dont want diet pills or surgey since im so young and that would be fake. but not over the top i want to be a better person pleee help also what should i do with my hair it is almost shoulder length layered and i have a oval head shape