Based on jtobako's comment, I'll also assume ye're in yer early teens. That said, ye should be able to, by now, tell whether or not a girl has feelings for ye. The only thing I'd be worried about, if I were ye, is getting mixed signals. All the above mentioned are very obvious clues, but, in my opinion, the greatest tell-tale signal is the soft touch. If she frequently reaches out to touch yer arm, shoulder, knee/leg (if ye're seated) or even abdominal/chest area, ye know she's got something in mind for ye. This also works both ways; if she responds positively to a light brush of the shoulder as ye walk past her or any such thing, ye know she feels the same for ye. There's a girl I like and know likes me back; we practically can't keep our hands off each other, non-sexually speaking, of course. I normally wouldn't go for the asking her friends' friends, since I don't like getting word out too soon, but to each his own. Hope this helps out, man.