<human>: I'm in high school and I like this girl. I'm an outgoing guy who talks to everyone. 

The girl I like is very pretty and I like her personality. I can flirt with any other girl in my entire school (even ones who are PRETTIER than this girl) and usually do so with great success. I text these girls constantly with no problems.

However, for some reason, I cannot push myself to flirt or escalate with the one girl I actually like. In school, I'll almost ignore her and sometimes even be mean to her, and I just don't know why. Outside of school, we've hungout a few times but even then I was just cold and quiet, which is usually not me. In addition, I always find myself SO nervous and ultimately not being able to text her to set anything up or even just say a funny joke.

Can you summarize the given text in a few sentences?
<bot>: I can flirt with every single girl I know except the girl I like. I'm usually quite and mean to her.