no you don't need supplements at your age. what you need #1 is to get on a good workout program where you put in the hours and train with CORRECT FORM. talk to your high school football or weight lifting coach for his advice. if he is worth anything he will help put you on a program.. also try and play sports where you get in a lot of running like soccer, track ,cross country etc. this will get you physically fit and boost your heart health at a young age
as far as diet i am not going to tell you what 99% of guys will say on forums as if it is going to be realistic to eat 100% clean. everyone at that age ate what their parents or school gave them so it is laughable for me to tell you to go and buy quality food from the supermarket. just try and avoid the glaring junk food, fast food, sugars, soda, etc.
what you do NOW as a teen will help bigtime as you age
and once you go to college next year or two you will have access to good gyms and it will be FREE along with your tuition so you can take what you learn now and use that to be consistent in college.. the chicks will dig a guy with decent muscle