Let people think what they want. Tell them you eat 20 pounds of chicken a week, take creatine and lift heavy. They will think you are using even if you deny it. Just be yourself.
Maybe I don't see the problem because I'm not that big, but people comment on my size increase (started TRT in December) all the time and I just say "thanks." If they joked about steroids I would just say no, and I am certainly not going to split hairs about TRT vs. AAS.