Is it normal to have a crush on someone you've never even talked to or barely know?

I think I might have a crush on a girl I never even talked to. I just returned to school after 1 month away for travelling to my birth country. When I saw her when she entered the classroom I immediately felt attracted to her. I sometimes found myself staring at her during class or during breaks. When I left school for the day I found myself thinking about her but I've been unable to stop thinking about her ever since I returned home
Is it normal to have a crush on someone you've never even talked to or barely know?
Post Opinion