I have taken monster plexx and sustanon250 for prohormone and lg science xtreme for pct and I took NOW liver detox for it
and what you mean shutdown
If you don't know what shutdown refers to, you clearly haven't done enough research. Second of all, monsterplexx is insanely harsh since it's 4 strong methylated compounds, if you didn't get gains off of it, then you definitely have to re-asses everything you're doing, mostly diet if I had to guess. You're 18, so your test levels would normally be through the roof anyway, and your body is still developing, so a PH now would only do more harm in the long-run than good. Monsterplexx has superdrol in it, so I would hope you used a SERM for pct, otherwise you could have some serious issues.
I agree with everyone on here: get bloodwork done and make sure you haven't seriously damaged yourself. Then, just train hard, eat, eat, and eat some more. Then, if you want to dabble in manipulating test, try a natural test booster in about a year or 2, Not a PH. No real side effects, no pct, not gonna screw your system up. Finally, just be patient. You're only 18, so your body is primed to grow. I'm only 20, but I've learned to just be patient and put the time and work in, and it all comes together in due time. But hey, that's just my 2 cents