How Can I Make Friends?

I am the biggest loner in my school and have only two friends, who only see me as a casual acquaintance. I like being alone most of the time, but I want to practice being friendly. I want to be a teacher someday, so I probably should start getting some people skills now! lol I need some ideas! i'm always so awkward and quiet around people, and they generally don't talk to me or seem interested in me. thanks!!!!