Here's what I think happened: I tried that site with some success several years ago. This was back in Over the next few years, online dating became more popular in the mainstream.
This led to a massive increase in the number of guys messaging girls. This, in turn, led to many women raising their standards accordingly. As a result, men who were average and below, or even slightly above average, tended to give up on online dating. Only the very highly desirable men remained, and these are the men who Okcupid good for hookups afford to have many casual hookups. That's around when I first used it too!
Guys are always up for hooking up. Dating, no so much.
Any free site is filled with guys looking for sex. There are some serious ones too. But you are going have to dig them up. I've sent a few messages to a couple girls on POF and they weren't just 'hi how are you' i was asking something i saw on there profile or i opened up with a joke.
There's nothing wrong with how you look.