I've had the problem at a few different times in my life that, whenever I actually suggested to guy friends that we hang out, they interpreted it as a pass and thought I was gay. I'm not making this up at all. I think part of the problem is not just the way that priorities change as we get older but the fact that the US seems to have an extremely closed-off and anxiety-ridden culture to begin with. Maybe, in a sense, people here have too much personal space and just aren't good at being around each other?