would you need someone to tell you you were heterosexual, or would you figure it out on your own (having rarely, if ever, seen it before)?
try considering things from other people's perspective. you'll find that it opens up your mind and heart to various forms of empathy!
Your imagination has clearly gone way off the deep end here. Reading that there are gay people doesn't turn people gay. If you think it does, that says more about you, I think.
Trying to hide the existence of gay people from children leads to homophobia from the straight kids, and mental health issues from the gay kids. You are dead wrong here.