How to make it roll

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tl;dr [spoiler]I'm trying to interest younger girl.[/spoiler]

All my life I (21yrs) haven't had a single kiss with girl except from family. Well, I had some crushes - was close to serious relationship in junior high but screwed up with my hesitation.
In high school had crush too, but I was only her good friend. Overally, during highschool I probably got "this good, funny >>>friend<<<" from girls. Well, I was reconciled with this at least.

Im after my second year of IT studies and given my faculty's nature - there no cute girls so I hadn't even chance to fall in love.

To the point - I'm anime enthusiast and one time per year I'm going to the con in my country. It was my third time. We go in 10ppl pack because we can't stand the rest of people in there.
This year I met there 18yrs old girl - cute (as for m/a is strange) and stoic. We talked to ourselves sometimes but not as much.
I was so intimidated by her that I wrote to her 3 days ago on fb. And well - she is so polite, that she don't dismiss me with some excuses. I try to keep talking to her, but it looks sometimes to me like I'm forcing this.
I'm not used to talking about nothing but I tried so we still had some connection.
I just had to lament to you. Idk if I should still talk to her or leave her cuz maybe she is too polite to be sincere with me.