I agree with a lot of what these guys are saying here, such as you needing to get the basics of training & nutrition down before exploring AAS. Look, my thoughts & feelings have changed a LOT over the years regarding when it is acceptable to begin using AAS (as there are many different factors involved and no one's circumstances are the same), but even though I have become much more lenient in my views, I generally will not recommend AAS to guys if I think they will become a diadvantage in the long-run. What do I mean? If you haven't learned how to eat & train for growth and you begin using steroids, in many cases, such a person has even less of a need to learn these basics, ultimately holding back his long-term progress. This person often begins to depend on them to make gains he could have easily made...and I mean EASILY made himself without drugs.
Just as important, steroids will only take you so far if your nutrition isn't adequate. Sure, you will likely make decent progress at first even if your diet is shit because of steroid's nutrient repartitioning capabilities, but progress will quickly stall out if your nutrition doesn't match your progressing development. I see these types of guys all the time...they weigh about what you do...160-170 lbs at 6 feet tall...and they contunue to flucuate between about 160-185 lbs for years, depending on whether or not they are "on" or not. They never move past this point. At such a level of development, there is no need for this bodyweight rollercoaster. Your body could easily maintain 180 lbs without drugs...even 200 lbs or more, depending on your natural genetic ability to hold muscle tissue, especially at 6 feet tall.
While I personally do not take my training seriously (as I am not a competitive BB'r), I was serious when I first began as a natural at age 22. I had trained previously, but my diet and even my training was shit, so like you, I never got abve 170 lbs at about 6'1. I was lean (under 10%), but small. When I finally put together a serious program at age 22, I jumped from 167 lbs to 208 lbs in 12 weeks! My bodyfat did not rise more than maybe 6-7 lbs...max...still had abs visible and my strength went through the roof. My bench went from 225 X 6 to 315 X 5...my overhead press went from 135 X 8-10 to 205 X 6-8...my dead lifts went from 245 to 405 for the same reps...leg presses, chins, and everything else went up eqaully. I trained my entire body hard with only the basic exercises...a very solid program for a beginner looking to gain mass. The program was well structured and my diet was very well put together. I went from eating about 2,000-2,500 cals per day to between 4,000-4,500 per day. Luckily, my fast metabolism (fasther then than now) allowed me to do this with minimal fat gain, but my body was so starved of nutrition, that when I went from zero to 100 miles an hour in every area that mattered, I just blew up. I added significant strength at literally every workout for every bodypart for the entire 12 weeks. I added 41 lbs in 12 weeks...most of it lean....drug-free, right out of the gate. I took me another 2 years of drug-free training to add another 22 lbs (hitting 230 at 6'1)...then I stalled hard.
I often tell this story because it shows just what can be accomplished when you really get your shit down right. Beginners often have the ability to make better progress than many 1st time steroid users...but they rarely do because they are fucking up basically everything. Fortunately, I read extensively for many years before I got serious at age 22, so I had a very solid foundation of knolwedge on which to build my body, but even if you don't have this advantage, you should still learn the basics of BB'ing training, nutrition, and recovery before jumping into AAS...or else you stand a good chance of being one of those guys who doesn't even look like he uses AAS and continues gaining and losing the same 15-20 lbs over and over again.
