Yup... been there, done that. Especially in high school, most of the girls that I thought I had crushes on, really it was just jealousy. And this is why, quite often, it was not the conventionally-attractive girls that I was obsessing over, it was the girls who were more like female versions of me, or at least what I wished I could be like... nerdy, but in a way that was still social, nice, open, and just a bit silly and spontaneous, but still with VERY nerdy fangirlish interests. I really was trying to live through them. And I would always be asking them weird questions while I was talking to them, trying to kind of gauge a "what's is like?" thing because I was so curious, and they always looked at me weird, so yeah, that definitely happened.