I dont know what to do!

Hello people!

I really hope some of you can help me out here, or just give me some advice

So...I'm a 16 year old guy, and I havent really found a girl that makes me think "I wanna marry her", and I dont really know much about love.
Two days ago I was at a party with some friends, and random people. I met this girl, and I tell you she was probably the most beautiful girl i've ever seen. She was perfect!

I talked alot with her, and later the night, we really seemed to like eachother, I hold her hand, and put my arms around her, alot. I was really happy at the moment.

But when she was going home, I asked for a kiss, and she said "No, another time" (basically because she dont want to kiss guys while being drunk and stuff)
And thats not whats bothering me. The thing is that I added her on facebook, and I dont know if she feels the same way about me, or I'm just "some guy" at a party.
I'm really scared of texting her. I dont want to seem desperate, and i dont wanna bother her, I dont want it to be awkward. But she might think that shes only "another girl for the night" for me. But shes not!

What should I do? I'm not really the guy who just starts a conversation on facebook with a girl. But she's so perfect, and if she feels the same about me, I will not let her go. I just cant get her off my mind

Thanks