I had a crush on a girl in my first year in the varsity. I don't know -how to talk to her and I keep seeing her everyday. I wish I could talk to her then but I couldn't so I had to move on.

This is what I did maybe it will answer your question. I stopped thinking about her obsessively. I stopped looking at her whenever she entered the class. I stopped checking her facebook profile. And later on I felt okay and I wasn't disturbed again.