Lots of things are pretty close to the subject of gay/straight, since it’s a pretty big topic. I mean, you could tie in marriage, adoption, laws, discrimination, genetics, pride, people we’ve known, history, Stonewall, FOX News, Obama/Biden, slash, fanfic, the Holocaust, rainbow rings, the Rocky Horror Picture Show, Santorum, Martha Stewart, and Coca Cola if we really wanted to, but most of that wouldn’t be considered terribly pertinent to the actual question.
On the other hand, sexual orientation is pretty much the subject at hand, since the question is about when straight people realized they were straight. I originally wrote this question (long ago) as a sort of reminder to my straight peers that while they may have “always” felt that they were straight, they usually expect gay folks to have a moment when they realized they weren’t straight, as if a straight orientation were the tabula rasa of the entire human race and it took something to knock a gay person into gayness.
If you are proud that you’re straight, more power to you, I guess. It makes about as much sense as being proud of blond hair, brown eyes, any kind of ancestry, astrology sign, or, frankly, gay pride. People don’t have to do anything to get it, but they’re proud of it nonetheless. It’s fairly tangentally related, though.