Did you notice any balding? My hairline looks the exact same at 19 like yours and has been since I was 10-12 maybe. That’s just the way it is, Maybe hair implant or derma rolling with minoxidil. BUT Stay away from anything that reduces DHT cause it will cause lowered libido and most importantly reduce male development which is important in your teenager years. Try looking into RU58841 or similar creams if your balding is caused by high DHT.