How do you get over someone you've fallen for in high school?
The truth is you can't get over someone. Especially if you're in the same class with them. Especially if you've tried to pick out their bad points. Especially if you've tried to like other guys. NOTHING SEEMS TO WORK.
Yes and no: high-school-aged kids often perceive themselves to be in love, but due to their youth and inexperience they may not be aware that what they are experiencing isn't really love but more a passing thing, etc. It is rare for someone to still be in love with someone in one's mid-20s after falling in love with them in high school (though not impossible).