You are on the young side to be using AAS but more of a concern is that you're only 161 lbs at 5'10" and not that lean. It's recommended that you at least approach your natural potential before you start using AAS. Im sure you could put on a substantial amount of size without AAS providing your diet and training were on point. If they are not, you will not get the gains you expect or keep them with the use of AAS.
Spend some time researching proper diet and training. If you can't gain another 20lbs naturally, you have something out of place and AAS will not fix that. Spend at least a year with a proper diet and training in place and see were you are.