You will puck yourself up forever. I did it at 18 now I am 41 I spent 20 years of my life going to doctors all over the country trying to find out what was wrong with me. At 17 you will get what you are looking for with a proper diet. Without a proper diet the gear will still not give you what you want. You don't just take Roids and get big. it will be the biggest mistake of your life