Am I over thinking this, or is this relationship never going to take off?

Hi, thanks for reading :)

Short version: I've become attracted to a woman I've known for a while, and I think she's at least a little interested in me too. So far so good :p

Difficulty is I tend to be quiet, but she's incredibly talkative. We also have differences in our sense of humour. Just off the phone to her, and after 2 hours I could feel her carrying the conversation; I just couldn't keep up. And unlike previous girlfriends, I couldn't rely on my sense of humour to carry me over dry spells.

Are we fundamentally incompatible, or am I over thinking it?