<human>: I like a girl and I do nothing about it.
I know this isn't really such a big deal and I don't know if I'm supposed to post this here but I just don't have anyone to talk to about things like this. 

I've liked this girl for the past year and a half and I have done nothing about it. She's one class below me and I have absolutely no reason to talk to her except that I like her. 

I'm only 17 years old and my High school finals are coming up. I'm most likely never gonna see this girl again. I never had enough courage to talk to anyone, let alone my crush. I'm a pretty introverted and shy guy and I think I have social anxiety disorder. She's always with her best friend so that makes it even harder for me to approach her.

I know her name. I could possibly add her on facebook but she has no idea who I am and it would be really creepy if I just come out of nowhere and add her on facebook. 

Sorry if I make a big deal out of this or if I sound like a teenager with problems that aren't real, but I just wanted to tell someone. How common this may be, I still wanted it off my chest.

Summarize the given text in a few sentences.
<bot>: I like a girl. She doesn't know me. Most likely never going to see her again. I'm shy/have no courage.