First off, please do not double post. It's a pain in the butt, and a lot of the time your question will be answered twice and that takes up valuable time that our staff and voluteers have, when they could be answering questions that had been asked only once.
To be frank, if you're old enough to be having sex, you're old enough to be taking charge of your sexual health. That means seeing a doctor regularly for gyn. checkups, protecting yourself and your partner, and having open communication w/ your partner and family members. You don't seem to have any of this. You just need to come right out and tell your mother what happened. She may not be happy about it, but she might be able to put you on the right path ... Be it w/ money for the doctors visit, or just plain old advice.
Also, sex is not about orgasm. If you're having sex simply for pleasure, you're missing out on all the other great things sex can offer. How in tune w/ your own body are you? Are you able to give yourself an orgasm? Instead of engaging in partnered sex just for that, why not give it to yourself? You won't be able to pass STD's back and forth and you wo'nt be able to get pregnant.
Do you know how to protect yourself against STD's and pregnancy? If not, you may want to educate yourself on our handy dandy site, here. If you do, and you're choosing not to do so, I can't really do too much about that. We're here to offer information, not babysit. Maybe now that you may have an STD, your thoughts may change on when and how to use protection.
Check out some of these articles for more info;
The STI Files
Safe, Sound and Sexy - Safer Sex Primer
Sexual Response and Orgasm
Ready or Not?
Words of Wisdom