Why this girl is behaving like this with me?

well in my honest opinion, maybe it's the age thing? She is young, and you don't know how she really feels. Maybe she is scared and nervous, people might be scaring her about online predators? who knows, if you have a gut feeling your wasting your time, maybe your right, but then again, it's up to you if your willing to be patient and wait.. hope something i said helps :)