Why dont girls like me?

Im 16 years old and junior in high school. I havent had a gf since 7th grade pretty embarising. I talk to girls and they seem to like it but soon we just drift apart what am i doin wrong i dont think im ugly and a couple girls call me " cute" idk how can i get girls to notice me and like me im kinda shy a nice guy. Please no f up comments thanks!