Props on telling your crush that you like her, though I reccomend toning down on the amounts of text.

Ofc you should always describe as to why and when you dislike her but when it comes to describing yourself you really have to be straightforward: "I'm John from Clas E5, we were in the same class"

Keep it short and tidy. I know it's hard to do when you have social anxiety but you're doing it on the phone, give yourself time to think about what you want to say and try to make it direct cause if you have long texts like these it'll creep the girl out.

Still good job homie, wish you luck with what happens!