I don't remember him bringing up steroids at all unless I missed something or it was in a PM. But Malic, I'm going to have to agree with BiggerStronger here. Instead of asking questions every time some minor detail comes up, do some reading...the answers are already here. Especially hundreds of posts answering this question you just asked. If you had just done some reading you would know that more is not better if you're trying to gain muscle, I've heard it a million times!
I try to answer all your posts because I understand where you are coming from. You remind me A LOT of myself when I was your age. Same build, weight, curiousity..everything! I wanted to know it all right away and find the perfect way to do things along with that "miracle" supplement that it seems you are looking for.
I have answered 2 Tribulus posts of yours now saying it's not worth your money. I'm not an expert here by any means, but I have tried A LOT of supplements out there, especially when I was your age. I have been disappointed many times because I expected a lot more out of them than what I got. If you want my personal opinion you ONLY NEED Protein, a Multi-vitamin, maybe creatine and glutamine, and tons of food right now at your age. I wouldn't worry about any type of testosterone at the moment, your body is producing enough. Eat, train, and REST. It took me a while to get this through my head too, but don't overtrain! I overtrained for years and it hindered my gains.
You may not see gains right away, but keep consistent. I used to get down on myself all the time because I have always been small and it didn't seem like my hard work was paying off. But if I look at myself year after year in pictures, video's..etc. I can see my progress. Your gains will come gradually.
Be thankful you have this site. I wish I had found it when I was your age. But also try to learn from the posts here. It doesn't seem the info is sinking in, you are somewhat asking the same questions over and over again. Also, the best way to find out if things work is to try them. Try different training techniques see what works best for you. Keep stats of your physical condition as well as what weights you are lifting each time you try something and this will help you in determining what works best. As for supplements right now at your age, I spelled it out above for you. If anyone has anything else to add, please do. Read up, most of the questions you ask are already spelled out for you in other posts. I hope you are able to stick around... Good luck!