How can I get girls to like me?

I am bloody 17 and never had a girlfriend in my life. Girls at my school say that I am cute and humble, however I never get approached by girls so often, I am quite shy. However when I get to know someone I get on so well its like we been friends for many years. Could you girls help me. Im not a boy that takes advantage of a girl, I like girls that have a strong heart and like a good laugh. Do you think I have a chance. I also have acne that make me look kind of ugly