Why do guys take advantage of girls in highschool?

MyLastRemnant
I'm 16 and about to be a Junior in highschool. The 2 years I've been in highschool so far I've seen almost exclusively bad relationships. There are the guys that anyone should be able to clearly see are duchebags. Girls will always go for the same guys and even guys who are known to cheat on their girlfriends. I've had multiple crushes and each one I've talked to for months and months only to have them friendzone me and go for a guy who just looks like a duche. Sure enough they break up after 2 weeks then she complains on snapchat and cries about it. When I was there for months trying to show her I would actually care and show her I want a mature loving relationship. The one thing that really hurt me was when one girl I had been talking to for over a year and absolutely adored, lost her virginity. She told me she would be waiting until she was older and I told her to because no guys in highschool are worth it. She told me she didn't want to have sex anytime soon. In the time we talked she had gone through 3 relationships all of which lasted less than a month and I thought it would convince her that I knew what I was talking about. The guy she lost it to was a senior (she was a freshman at the time) and now whenever I think about it I get physically sick. I actually feel the need to throw up. I dont understand why girls do this, I'm always incredibly nice and caring but I'm never given a chance. I dont understand why it's so hard for girls to see who the genuine guys are in highschool. It's so bad to the point I think everything is a simulation, every girl cannot be that... stupid. I'm actually baffled. I get so stressed out trying to prove to girls what will happen when they get with a guy, but it never helps. I will be spot on, to the T with my prediction and they dont even think about it.
Updates
+1 y
More of a better question is, how do the girls allow themselves to be so blatantly used? The guys try and brainwash them... how can you not see how bad of a guy they really are? How can you allow a guy you barely know to have sex with you? Even take your virginity... but the guys you talk to for years even aren't given a chance to even date.
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+1 y
Why am I so emotional? I'm 1y shouldn't I be some asshole guy who wants to have fun with a bunch of girls? Why do I want to find a girl to have a meaningful realationship with. All my friends tell me to loosen up a bit but all I want is 1 girl I can love. I get so stressed and feel horrible all the time because I miss having someone I can show affection towards.
Why do guys take advantage of girls in highschool?
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