Perhaps it's the way that you type? I read a study in Popular Science once that found interesting differences in the ways men and women tend to type. Men, for example, tend to put all of their thoughts into a single giant block of text, and use punctuation very sparingly and often incorrectly. Women, on the other hand, tend to break up their thoughts into several lines and use excessive amounts of punctuation, like you just did in your title, and this line:
"But still, What could make everyone possibly think so?!!!...."
You never need that much punctuation. Further, for something a little less scientific, your post seems very agitated and emotional (as evidenced by the sub-par grammar and spelling), which are traits more often associated with teenage girls. Thus, if you want people to assume you are male from reading your posts, cut down on the punctuation, and "slow down" a bit. Take the time to make your posts seem calm and emotionally neutral, and, of course, check your grammar and spelling.
I admit I this you were a girl at first too, I can't explain why though, it's just a quickfire estimate based on any number of patterns in username/icon. A lot of people this I'm a girl for the same reason, until they see my ID anyway.
At least yournot like my poor guy friend who everyone thinks hes gay. He like neither boys nor girls hes asexual! But he doesn't help his case he uses hand gestures like women do talks about Jean sizes and he acts girlier than me!!
Ew, one of the things I passionately hate about people are the ones who can't cook. You should know how to make rice and some chicken. If you're 16+, you should know your way around the kitchen. I especially want to slap you kids who leave home for college and can't even boil water. And microwave food is disgusting.
I'll fart on her instead. But seriously, you're old enough to learn and cook on your own. Cooking can be fun, ya know. And this is coming from someone who doesn't cook all that often. I just know how some things are made and when given the chance to make something, I do just fine.
Oh, and it helps to have some common sense and know basic science.