Hardgainer Answers

So I basically go to the same gym (our city rec center gym quite big) almost everyday for the last 8 months months, & every since then there was a boy who was there all the time too at the same time as I was there, I see him there just about all the time. He was 14 when he first started, he was quite small, usually there with his older brother who I talk to occasionally if he is there (he is 25) real big guy & there is no doubt he is on steroids himself. Over the first few months I see him there, he was quite skinny, about 5′4-5′5 at the time, looked about 120 lbs & just looked like he was building muscle in a normal safe way.
Now in the last month or so, he hasn’t been there at all, & then I see him again starting to go there, alot of times alone he is now 15. He stands out from everyone there, he is normally the biggest person there (as all adults) he looks about 5′6 & is 170 lbs & his muscle growth seemed like it was way too fast, I even noticed right when he starts to lift weights or do an exercise his whole body turns red & veins pop out immediatly & his strength increase almost seems abnormal. I remember him doing bench pressing 25s on each side which was 95lbs in total & struggled with that, now he is doing 10 reps of 215 with ease.
Is it possible he is on steroids? He has alot of acne on his back & shoulders, looks ALOT older, (like in his 20s) & body turns red imediatly.
What would you think?

Is there such a thing as naturally occurring steroids formed in the body?
This might seem a bit clearer if i start from the beginning. I’m a female & basically I have the ability to build muscle & fitness faster than most people would. I am able to miss a month or more of training & then after do a few fitness sessions, return to my top fitness. This is the same for muscles I am to see muscle growth straight after a few weights or sit up/push ups etc. I am wondering if there is something in my body that allows me to do this, & I am curious to find out. However just to clarify the picture you may have formed, I have a X body shape so I am skinny & not bulky like German weight lifers