I'm going to just echo what others are saying.
Steroids is, potentially, a life long decision. Why? It may permanently screw you up, leaving you having to take a TRT dose for the rest of your life just be normal. Maybe you won't even give a fuck about being super big & strong in 3 years?
You can get pretty damn muscular and strong without any drugs. Granted, it'll be faster with drugs, but there are some serious risks with it. Do your own research; don't just listen to some dude trying to sell you shit.
And you can get pretty big & strong naturally. I too started lifting in my mid-20's, by the way.