Your friends are IDIOTS!!! First off 4 months is NOTHING!!! You need to lift naturally for a while before you start taking AAS! They are best used when you hit a plateu and trust me you have a long ways to go. If I were you I would look into just consuming as many calories as possible, HIT IT HARD, and possible look into creatine and protein. At least wait a year of serious lifting before you take AAS. The gains you have made so far natural are awesome so way take anything?