You have it all wrong. Don't look for a relationship, you're just seeking someone out to fit into a prescribed model, and it won't work. If you're looking for these things that hard, you appear desperate and immature.
Take a long view - at school age you do NOT need to be in a relationship. Try and become close to girls in a friendly way - it will serve you a lot better in the long run. When you meet someone you like, then go for it, but you'll just end up ruining whatever friendships you have by trying to slot whoever is available (but with whom you don't have a connection/any particular attraction) into a relationship with you.
Although many sources want us to believe that life outside of a relationship is terrible and makes us worse off - television, films, poetry, friends, hallmark, valentines etc. - it is not anywhere near as important a deal as it seems. Forget about it, get intimacy and love from friends, fulfill your own sexual needs and enjoy yourself. Noone needs that additional pressure.