How can I tell if my crush likes me?

I’m 14, and I like to think of myself as a relatively good looking guy. I’m sort of tall, in good shape, and no acne. Also, I’ve had a crush on the same girl for an embarrassing 7 years. I’m not some kind of asshole and I get good grades so, I can’t find out how to get her to like me, seeing as how I’m getting to an age where I can date and all. She likes me as a person, but I wanna move in further. I feel like I have a hard time understanding social queues and can be hard on myself according to different people around me. Is that why or have I not done something that I should or have done something that I shouldn’t have?
How can I tell if my crush likes me?
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