How can give me some advices about girls?

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Hi,guys and girls, my lotters. Over time, I like less girls. Now I have 16 years, and so far I liked 5 girls, but not for "playing", I liked to have with them a serious relation. But the first girl like an another boy, third girl I think that liked me, but some of my classmates are stupid and idiots, fourth girl I don't know if she now that I liked her, and fifth girl know that I liked her, but she don't accept my friendship because we are classmates, a stupid fact (A boy try same thing but from same fact don't accept). I really like fifth girl, but I don't know what to do. Give me some advices about girls and what they liked. Thanks