<human>: Can you succinctly summarize the text in 1-3 sentences?

So to begin with, I'm 21, and the girl in question of this is 17 (18 in a few days, but 17 is legal where I live so that's mostly irrelevant.)

I myself have only ever had one other girlfriend, it was for a few months a couple summers back, and wasn't the most...structured or possibly healthy relationship. Ended amicably, but was a bumpy ride.

Anyway, on to the situation. We work together, and have for...close to a year now? I think. Anyways, she's sweet, and I've had people at work tell me I should try taking her out some time. I put it off for a while but finally asked her out to the movies (I understand some find this a poor choice, but it worked)

We had fun that night, talked almost the entire time (Movie notwithstanding of course.) A few days ago we had our second "Date" where I took her to the zoo, then some dinner afterwards, again, fairly nice and enjoyable.

But I've had this...niggling doubt in my head about going farther with her. I'm afraid of getting into a real relationship and finding that I don't /actually/ want to be in one, or that I'm not actually as into her as I think.

I've asked a few friends for advice, and it ranges from "Give it time and just go on some more dates and have fun, whatever happens happens." to "Literally kiss this girl immediately or she will get confused"

I guess what I'm asking about is, If I'm having these sorts of doubts or worries, should I just put a stop to all of it now, or is it alright (and unselfish) to keep seeing her in a fun, not-so serious way?
<bot>: Casually dating/hanging out with a girl, having self-sabotaging thoughts about going further. Is it nerves, or might there be actual truth to it?