LMAO! PoF is a free site, so you get all the wierdos and nutters as well as really nice guys.
Trust me, it's not you. You'll have a number of good and bad dates, from the good, you'll have fun. From the bad... well lets just say, IME, you'll still be entertaining friends with "truly awful date" stories for years afterwards! If I'm anything to go by, it'll descend into a girls night with wine, and as you become more inebriated you'll be competing for the worst internet dating stories. PoF is a "special site" anyway! 
One of my worst dates (off PoF), was a bloke who had a large badly mannered Newfoundland dog called "Baby". We arranged as a first "get to know each other" date, to meet in the park, walk our dogs and then go for coffee. He was so boring, he even bored himself! He would start telling me something and then halfway through the sentence, would get fed up of what he was saying and continue with "blah, blah, blah..." (actually say "blah, blah, blah").
Anyway, at the end of the "date", I decided to let him down gently because we had nothing in common and he then spent the next week ringing me about 4 times a day, sobbing down the phone caliming no-one understood him.
I now refer to him as "Sobbing dogboy"...
Then there was the solicitor who thought he was gods gift and after our first (horrendous) lunch date where he spouted racist, bigotted crap and banged on about his "superior social class", he told me that he'd "get his people to call my people so he could take me out for dinner..." I told him not to bother because it was likely that my people, would tell his people, to fuck off...
I work in conservation. At the time I was dating using PoF, I was working in front end "anti-poaching" conservation in Central America and Africa. One bloke I met, seemed really nice... first date went well. We got onto a discussion about fire-arms, because (of a previous life) I am qualified to run firing ranges. He had mentioned he was going to Bisley, I'd said, Oh... I know Bisley...
second date - he informed me that his hobby was shooting and killing things and he hadn't told me this on the first date because he didn't want to put me off... He then informed me that his big aim was to go on a canned hunt in Africa, so that he could "bag a lion"... He got the hump when i refused to see him again and called me unreasonable!
My point... There are some real lemons out there. But then, I know of a number of people who have met their DH or DW on dating sites. Don't give up - just laugh at it!