Do you think this girl likes me?

I have known this girl for months and have liked her for a long time. We became very friendly around February and we have talked allot. Recently (past two weeks) we have talked nonstop. Usually for about 9 hours a day (using Skype, in person, phone, IM). We have talked about everything. Is telling me her hopes and dreams and secrets a sign that she likes me? We have also had long conversations about how much we want to have sex with each other. Is she just playing with me? Does she like me? Will I end up looking like a fool if i pursue this? She is all that I can think about. Her going on a two week vacation without any ways of talking has made be feel depressed. Is it normal for me to feel this way? Please, I really need good advice. BTW I'm 15 and in highschool.