I've been seeing her for a couple of time and this os the first girl that reacts like this, though kino as been good and I got as far as fingering her from "behind". Here's the catch, whenever i try to escalate to sex, either trying to take her pants off or having her grabbing my dick, she always "blocks" me. She either tries to stop me immediately (taking of pants, usually when I'm fingering her), or she just starts acting very nervously (grabbing my dick, starts laughing and shaking while still looking at my dick with an eye that's "craving" it). So I'm assuming that she wants to fuck but I'm not sure if I'm fucking up somewhere (I may have been a little of a pushover last couple of times) or if I need to help her "loosen up". Also as far as I can tell she's pretty insecure and possibly a virgin.

What are your guys thoughts on this? Also on a side note, she's very submissive when I tell her something (take your shirt, take your bra, etc).