<human>: I'm 17 and I've never even had my first kiss. I've been looking to get a girlfriend, but it's becoming increasingly difficult. All the girls I like have parents who won't let them date. The one who actually did get to go out with me went awful because I had no experience and soiled it by being too clingy and, i guess in her eyes, creepy. 

So basically, I really want to find a girl and there's really only one who is in my league and attractive to me, but she doesn't even know who I am. She and I only share one class, and she sits across the room, and her BFF is in that class and the two are always together, so I don't have a chance to talk to her alone or anything. I don't know how to get close to her; the class is an elective so we don't have homework (so I can't ask for her number by telling her I have a homework question or anything like that). 

I really wan to give it a try. Like I said, five different girsl have all rejected me because their parents won't let them, so I don't want this to happen with her. Obviously, she will reject me if we don't at least know each other. But I can't get a chance to go talk with her.

What should I do? How could I make up an excuse to leave my friends, go across the room, and just chat to two random girls who I don't know without seeming weird or creepy? 

I'm not very smooth or suave and my flirting/dating skills are extremely limited (like I said, I have no experience) so I'd really appreciate any advice. 

If you need any additional details just ask. 

Thanks.

Can you summarize the given text in a few sentences?
<bot>: I like a girl in one of my classes, but she sits across the room and is always with her friend. I want to start talking to her, but I can't find a way to do it without seeming awkward.