I'm also 21 and also deal with this, perhaps due to my adrenal glands issues (I don't have PCOS). I also had this terrible acne I've treated with isotretinoinum (and it's back after 3 years!) and general virilization (for example, my shoulders are wide and my butt is very flat). I'm not a brunette, yet I have this strong, black hair on my belly, arms, thighs, butt (this one is the worst) etc. It's very frustrating, the laser hair removal could only do it, but it's too expensive (yet I recommend it for those who can afford it). No meds take it away for good.
I'm in a fairly comfortable situation because I'm not in relationship and don't do sex, but I imagine how hard it must be for a woman to keep it under control constantly if she wishes to stay smooth for her boyfriend etc.