No friends :( Help

I'm Mongolian. I have tried to make new friends but it didn't work. I don't know how to make friends. I eat lunch alone at a table by myself. I do homework by myself at the library. I go on the computer in the computer lab by myself.
I feeling loneliness so deeply. Almost i never had a friend before. I communicate with my classmates in a polite way. I help them. Nobody humiliate me. Now I'm 15 years old. I study at secondary laboratory school. I'm 10th grade. I really need real best friends who change my life style. It may sounds crazy. But I imagine in my mind that I have 5 good looking smart friends who help me in any situation. I imagine that I'm going to cinema, having a lunch together,doing homework, having a fun, playing basketball or ping-pong with them.
Sometimes I'm jealous of some friends having a fun and laughing. Then I feel that I'm lonely one. I am pretty, good at all subjects,polite, helpful, little bit shy, sometimes not confident on stage boy. Give me some advice please. Now I want to cry. Because I'm depressed. Help!!!