How can you tell if a girl is just messing with you or really likes me?

I'm semi shy. I can talk to girls no problem like asking for a pencil or talking about how much we hate the teacher. I can't get any closer like a date or seeing each other after school. I don't know if I'm attractive, like no clue. In my past many girls mess with me and I like it. As I think about it later, I think she just wants to break my heart and get a laugh. I don't want to throw away my first real relationship!
How can you tell if a girl is just messing with you or really likes me?
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