Is this wrong (age difference question)?

Hi, I’m 17 years old. I don’t turn 18 until September. However, I am a senior who’s supposed to be a junior. The reason why i’m a grade ahead is because I was born a day before the cut off. But anyways, I have a crush, I just figured out he was a freshman. People keep telling its fine to still like him and make a move since i’m supposed to be a junior anyways. But I don’t wanna be a creep, I’m basically on here to get feedback from older, mature people.
Is this wrong (age difference question)?
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