I was once in your age and didn't have any experience in buildings muscles and made a mistake you can learn off.
My recommendation is try to build muscles for 6 months without gear, don't waste your potential, maybe its just me.
When I was 22 everyone of my friends have been on gear, it was easily available in my circle, we actually had the good ones back in the day.
I didn't have experience with gym, proper diet, cardio or anything and started injecting 250mg Eifelfango's every 7 days without doing any research and trusting the one friend that injected in my butt.
I gained some serious muscles but it was not worth it, when you start training, you get alot of gains very easy, why rush it?
I was exposed to high blood pressure (full cycle) and after ending the cycle after 4 month's I didnt do PCT after the cycle, I had erection problems after it, had mood shifts after it, got a depression. Think twice what you do with your body.
AND LISTEN TO
@Sam Bjorn he is experienced and helped me on planing my next cycle after 13 years, really thankful for it.
Think twice If it's worth your health and If you do it, do it right! Don't rush it, you are still young, I know there is a gear trend going on right now. You should get your training on point, your diet on point, don't waste the potential.
Sorry for my wise words, wish my younger me had someone tell me about it.
Is there a reason you are not gaining any muscles in your age? is your training on point? what kind of split are you doing?