High School Advice PLEASE READ?

Ok, so im a freshmen in high school and let me start by saying im NOT a push over at all when it comes to girls. But it seems like every girl I start to like just screws me over. I mean all the girls keep running to the straight up douche bags. im starting to think that its because High school is one big popularity contest and they just wanna go after the most popular I mean girls have put up with guys cheating on them. I mean there are lots of girls I could get with but the ONES I LIKE just keep screwing me over any advice and wheither it will get better. Please I really need some advice on this since my parents arent the best to talk to about these things THank you