IMO.. Wait until you are done growing naturally. Shows or no shows. You are producing free gh/igf1 now. Eat clean. Eat lots and train hard. Wait 3 more years to start peptides imo, your plates(bone) havent finished growing naturally, then they fuse around 22 years of age.
If you cant get to where you want without standard supplements, look into your diet and training. No offence, but anyone 18-25 doing Steroids or peptides is doing the basics wrong. Let nature run its course bud.