You can say you're attracted to nice guys/girls but that doesn't necessarily mean everyone makes the cut just because they're "nice". You need to click with the other person, be attracted to them, etc. I generally go for the nice girl, though there were some total sweethearts that I felt had nothing in common with or just didn't vibe with. And there were a few that came across as nice but after they opened up and got comfortable around me had some backasswards views, or deep seated personality issues like neediness, or lacked any sort of drive to better themselves, etc.
I'm awkward and nerdy but I've found enough women who were awkward and nerdy as well, or their personality complimented mine, that it worked out for me. Thinking that everyone wants the same thing and they're lying if they don't is silly.