6'2" and 200 lbs, and you have "decent size already"? SO, obviously you're not looking to get huge. Why not just eat twice as much (make sure you're getting at least 2 grams protein per pound of bodyweight) and skip the steroids that you don't need anyway at 20 years old with probably the highest natural test levels you'll have in your life?
What about your lifting experience? How long have you been lifting seriously, without any long breaks? What are your goals? Short term (next 3-6 months) and long term (2-4 years)?
Sounds like you're jumping in too soon. I'm sure you could gain another 20-40 pounds naturally...but it won't be easy.
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