Prohormones ARE steroids, bro. If you're worried about using AAS in your early 20s for fear of HPTA damage, you should avoid prohormones as well.
If you do decide to run a PH though and not AAS, I would strongly recommend superdrol. 30 day cycle, people can put on 10-15lbs of quality mass and drop some bf% while doing it. Sides are kinda tough, user dependent, but worth it.
UDCA strongly recommended with this, as it's pretty toxic.
Check out Trenavar as well; it stacks well with anything. It's basically oral tren--but it's not methylated so there is no liver toxicity. chem name Estra-4,9,11-triene-3,17-dione
I stocked up on superdrol and even some superdrol+trenavar stacks when they were taken off the shelf. Being on TRT, I definitely plan on using them for blasts on occasion
PCT: Tamox 40 40 20 20
Clomid 100 50 50 50
I'd also suggest ditching the maltodextrin. Real food = gains. With the exception of whey protein immediately post workout, powders are pretty much useless. Try oats instead of malto