It seems like you have enough hair to still work with imo. I would say go for hair system only as a last resort if you cannot get a decent hair restoration from meds or transplants. It can be hard and time consuming to style a hair system so that it looks good or even real, so i would say only go for it if you are close to slick bald. I am also 21 so I understand the desire as a very young person to have perfect density and NW0 hairline which only a hair system can really provide, but you have to weight the options and understand the cons of wearing. You'll always be wondering whether it looks real, if someone can detect it, having to come out to significant others, as well as the ongoing cost and maintenance. You would really just be trading one set of problems for another.