You're still a little on the young side to use gear. First step is to not call it "roidz". Your best option is to start with a low dose of test e or cyp, along with a small amount of AI, just like any of the other first cycles I suggest here in the QA. How lean your gains are always comes down to your diet. Gear can cause some fluid retention but this water can be controlled through clean diet, good water intake and AI. So something like this. If you run a cycle like this, and have a good diet and training plan, you can increase dramatically. Then take a break and get ready to run a cutting cycle into your next show, bigger and ideally through the right diet and cardio plan, tighter than ever!! 

1-12

Test e 500mg EW split into 2 shots

adex .5mg EOD 

PCT starting 2 wks after last shot. clomid 100mg ED for 7 days. Then 14-21 days at 50mg 

IF you like you can run something like anavar as a kick start for 6 wks at 50mg and still stay quite tight