How bad is 217 pounds for a 14 1/2 year old?

i know its real bad but its weird i have so many stretch marks all over but i see other ppl who are also real big but i dont think they have soooo many stretch marks...but you know what, im not gonna give up even when i make mistakes, anyways sup with all the stretch marks? arms shoulders and chest and everywhere? wth? i havent been drinking barely any water could that be why?