Elementary School. It was a girl named Michelle Stanky (yeah, she got teased a lot because of her name) I remember her because she was in my class every other year (Kindergarten, 2nd Grade, and 4th Grade)
I think it was around 2nd grade when I realized I liked her, even if I didn't really understand why, I just liked being around her. We had a lot in common and she thought I was funny. I got teased a lot for being that guy who would rather spend recess with a girl than out on the playground, but I didn't mind.
I tried looking her up on Facebook a while back, but no luck. I think her last name may have changed. But oh well, that's just how first crushes go sometimes, huh?