I made friends with a bunch of girls this year. I noticed when I am sitting there they come over place their hand on my upper back, say hi etc and leave it there for a bit. Similarly if They are sitting with me and leave they do it again. or if they are far away they smile and or wave to me.
Most Helpful Guy
If you're seemingly confident & social but not forward like other guys then that makes you of interest but a bit of a mystery. which is good. Girls that touch you are unconsciously signalling attraction even if they don't consciously know it. The conscious is good at making up excuses. There's other signs which are clearer, body language they do when they're talking to you. You should certainly isolate the one you like and ask her in some fashion to spent time with you.1