Q: What if somebody finds out that I post naked pictures of myself on the internet?
A: What if somebody finds out? Finds out what? That you have a body and you like to be admired? Listen, if somebody finds out that you're a sexual organism, they're only proving their own stupidity, because they should have known that from the start.
We are long past the days when a person's value was measured by their so-called "virtue". You're not sleeping around. You're not getting yourself pregnant. Internet exhibitionism is the safest form of sex beyond masturbating in a locked room to your imagination (which is really not all that different). And it's a lot more exciting!
As long as you utilize basic internet safety measures - e.g., don't give out your full name and address, or tell people what school you go to - nobody's going to track you down or try to ruin your life. And if they do, they are the ones who are breaking the rules. Go to the authorities. And don't let anyone make you feel bad about yourself because of what you do. Because that's like letting the terrorists win.
Above all, know that you are not alone. We may be few and far between, but there are people like myself out there who will fully support you in what you are doing. We may not have the numbers, but we have logic and compassion on our side. And that's gotta count for something, in the long run.