Okay, you are part of an under-represented group. At the same time, though, your case usually isn't so clear. Who's to say any given Link isn't gay? I'm pretty sure his sexual orientation is rarely, if ever, confirmed, but his gender always is. And this is really the case for pretty much any character in a game without obvious romance or romantic implications.
I don't mean to undermine your side of this, I'm a strong LGBT advocate myself, but in regards to Zelda specifically, look at it like this: you can, if you desire, project yourself onto Link better than most girls can. You're male, and Link is clearly male in all Zelda games to this point. Is he gay or straight? Technically, we don't know! So if you were projecting yourself onto Link, as is the intention with the character, that part of you would not be compromised in most cases. As a girl, though, a big part of her identity is compromised right from the beginning. And this is probably more often the case in games in general. The game itself doesn't often let you choose your sexuality, but plenty of them don't do anything to compromise it, either.
And don't think for a moment that I'm against more explicit gay representation in gaming, I'm all for it, just that there's a bit of apples and oranges going on here.