How do you know if an extroverted, friendly girl is interested in you?

Anonymous
There is a girl in my college classes who is super friendly to all the other guys. Smiling, laughing, and touchy. But when talking to me, she is a little more quiet and a little serious. She still touches my shoulder most of the time when saying hello but is not as talkative.

How do you know if an extroverted, friendly girl is interested in you?
3 Opinion