<human>: Could you distill the essence of the text into 1-3 sentences?

I asked a casual friend, let's call her Elaina [16f], to prom because I have somewhat of a romantic interest in her. Last weekend was my junior/senior prom. We had an amazing time, danced the entire night, and on the ride home, she fell asleep laying on my shoulder. We talked the day after about where we wanted to take this and have been kind of talking about it all week. We have also spent time with each other through the week, and I really am starting to like her.

Yesterday, she told me about her stance on dating, which is that she doesn't like being "anchored" to one person. All of a sudden, I'm just some boy toy to her. I also found out she's like this, friends with benefits, so-to-say, with three other guys, all of whom I don't know at all. My direction in this was to be exclusive with her, but now it seems there's only a small chance of that. She seems to want to be somewhat intimate with me, but not exclusively.

I really do like Elaina, but I don't know if this is a waste of time, and I don't know exactly where to go with this, as I have never been in this type of situation before. 

The things I would like to get some advice on are as follows:

How should I go about this?

Should I avoid or end this?

And, are friends-with-benefits anything worthwhile?
<bot>: Caught in a situation with a girl I like where she wants to be friends-with-benefits, and I want to be exclusive with her. What advice can you give me on this?