What do I do about a girl that seems interested in me?

Alright, this is an… interesting turn of events for me.

I hav been alone my whole life, no companionship whatsoever, and no social life. Now, is is very obvious that someone likes my, yes, likes me. I have no clue how this occured, it seems damn near impossible to me, but yet here I am. It was fairly predictable actions, first adding me on facebook our of nowhere, chatting with me every day, the instant that I opened up facebook, asking If I bugged them I like to annoy everyone, kind of like observational phsychology because I likes them, I said no, she said good. Question repeated, same answer given, same response. Then she talks about how there is someone who might like me, tells me what they like about me, ask who I think it is, stuff like that.

I she asks who I think it is, I build a case up using the info I just gave you, she reacts with “omg” and “ur proving a point” several times. At the end there is about 5 minutes of gap, and she says goodbye, tells me to talk to her tommorow and says goodbye again.

she also said that she had a boyfriend yesterday, and today says that the person who likes me has a boyfriend, although there is no sign that she does.

Basically, this is how it went and unless my mind is fucked beyond beliefe, she likes me.

My question is, what do I do? Based on this she wants to be in a relationship, but I have no clue on the etiquette and protocol that take place. I am a chivalrous person, but I have never had “feeling” for anyone, at all.

Basically, what is your advice in this situation, it is completely alien to me. I am still going over at leat 30 different scenarios in my head of how this could happen and where is leads, trying to figure out the best approach to this, but I’m giving myself a headache. I have never even imagined myself in a situation like this, and now it’s happened.

So, Discuss.