^ No wonder it was 2 years before you heard from anyone.
Hey, if they can't love me for being a nerd, I don't want to waste my time!
True...but at the same time, too much overt nerdiness will scare someone away shrieking into the night if you've just started dating.
I hid my full bandwidth of nerddom from Mrs. SicOne until well after the relationship was hitting on all cylinders, by which time she was comfortable enough with me and I had proven myself compatible with her in many other areas that what would have been a game-ender was not that big of a deal.
It is good that on the second date you asked her what she wanted to do, let her set the agenda, rather than doing all of the driving yourself...good, sane women like to be in charge periodically, and this gives you an opportunity to see what she's like when she's in control of the evening, whether or not she's able to drive the date with equanimity or she takes it over completely and nitpicks everything you do, so this could be revealing.
But my best advice of all would be to just be yourself, albeit with more reservation about revealing details about yourself and your life and interests that might, shall we say, frighten the fairer sex. Unless she spends a lot of time on something such as the Trek BBS herself, she need not know how many hours a day you idle away on it. Unless she introduces a variety of vibrators, taking them one at a time from her purse and setting them atop the bar while revealing intimate details of her most recent session with each one, you need not discuss whether or not you own a blow-up doll, or how many you do own and whether they are a blonde, brunette, or redhead. Or any combination thereof.
So. Just like a smart woman hides her crazy on the first few dates, hide the more nerdy and loathesome aspects of yourself from direct view. If all goes well, there will be plenty of time to bring those things out screaming into the sunlight, by which time she will hopefully be sufficiently into you that they aren't deal-breakers. You're not constructing a fiction, you're just not totally revealing yourself.
After all, was it not Spock who said, "It is not a lie to keep the truth to one's self..."?