How can I tell if a girl likes me?

I'm 14 years old and I'm home schooled and once a week we have this thing called Co-op. There's this one girl named Ann and she is such a sweet hart and she aint bad looking. Now last time I went I was sitting in a corner...alone. And she kept looking over at me. Every time I looked she would be looking at me to. Now I've been trying to get something started for a couple of weeks. As soon as I saw her POW love at first sight. Now how do I know if she is watching me because she don't like me and doesn't trust me..or if she likes me and checking me out. Now I'm REAAAALLLL shy around girls so it's kinda hard for me to get a conversation started and some times I say stupid things. Please help me does she like me or not.