If you are 18, just wait a couple of years. You just might have a bit more developing to do. And if you eat big , have a high protein diet, and take some creatine like 'Stang told you, you will get biger and stronger. Roids aren't for beginners.
I WOULD TAKE FULL ADVANTAGE OF MY YOUTH AND TRY TO REACH MY GENETIC POTENTIAL 1ST,GET A FEW LIFTING YEARS UNDER YOUR BELT DO AS MUSTANG SAYS EAT A GOOD CLEAN DIET ,REST AND TRAINHARD .....
CREATINE AND PROTIEN BRO...