Height Increase. I get an igf-1 steroid?

Hey doc, I'm a Male of 20, I'm 5'1 & half. Weight 51 (more or less). I want to grow taller by 12 cms. My father was 5'7, mom is 5'4, both sides of family are relatively tall. I'm a vegetarian, non-smoker, non-alcoholic, non-drugs. I'm on whey protein since a year. I've been trying to get tall with all sorts of Process- which follows : Medicines supplements like- L-arginine, L-lysine, Melatonin, (as they increase GH) & Calcium & vitamin D for bones. : Workout includes : Swimming, Cycling, Sprinting, Stretching Spine & Legs, Jumps (to create micro fractures) , Kicks with ankle weights. Still not getting any results, been trying for a long time. What should i do? Should i get an IGF-1 steroid? Please help me out. I really need something, which can get me tall, its important. Thank You