1) You have great potential and a good starting physique for an 18 y/o natty. Don't even look at taking AAS until you're at least 25-28.
Period.
2) Listen to what
@DugPrime said. If you REALLY need to take something, look at a GLP-1 and a 200-500kcal deficit. I'm a fan of Tirz/Reta.
3) If you want to have a "
half-natty" stack, add the following on top of the Tirz or Reta: 200-500mg injectable L-Carnitine, 50-100mg Zinc Picolinate, 500-1000mg Magnesium Glycinate or Bisglycinate, 3-5g of Taurine, and 5g of Creatine Monohydrate.