Having sex for the first time tomorrow, and im really nervous, advice?

...just make sure you've got protection (condoms) and teach him how to get his face "down there"...teach him how to "work that tongue" and get all those "nectar's" flowing... (and) after he's got you all lubed up... then Huck the sachet out of one-another !

Don't need to tell you to be safe and rational about it. Everybody's already heard that a million times.

To everyone saying you should be married: please get out from under your rock. We're in the 21st Century, OK? Sex isn't the "Devil's work" and having sex with someone doesn't bind you for life!

Go with the flow Make sure you're in the mood. You wanna be wet for him so it hurts less and you're looser. Maybe get him to finger you a little, or if you know something that turns you on, get him to do that.
It probably won't be the best the first time. It'll hurt a little. But, after the first time it'll be great :P

Make sure you're not doing it for your man, though. Make sure you're doing it for yourself. Is him inside you any better than your own fingers? XD

Use a condom and backup protection, even if he says he doesn't have STDs. Make sure you know how to put it on. Talk about consequences before they can ever possibly happen.

Be sure you really want it the whole way through, and that your partner will respect your boundaries.

Communicate with your partner about what you like and what you want (people are not mind-readers).

Don't expect it to be great. Especially if you don't masturbate in ways that stretch yourself a lot, regularly, it's gonna hurt.

Being extremely nervous is natural; but planning it is akin to committing. Don't let him trick you into a 'you promised', or guilt you into it. Don't go into it expecting something unrealistic. The answer isn't to not do, but do be sure you're doing for the right reasons.

EDIT: I didn't realize you were a kid! Wait until you're older, more mature and capable of handling a more mature relationship which involves sex. Being so young you wouldn't know much about sex and what it involves. It'll be a big mistake. I know of too many young silly girls who have fallen pregnant because they don't know enough about sex.



Original Answer:

Hopefully you love this guy, trust him, feel 100% comfortable with him and he feels the same.

Some advice..

1. Make sure you wear a condom. Or take the pill. Or some other form of safe sex.
2. If you're not using a condom, I suggest putting a pad on your knickers because if he pulls out after he's released... It gets messy. Also you may bleed after wards.
3. Use lube. It really hurts if you're not wet enough.
4. Foreplay before will make things easier because it'll relax you and your muscles.
5. I suggest you be on the bottom first so that you can relax your pelvic muscles.
6. Don't worry too much about whether you're doing it right or wrong. It'll come naturally.
7. It is better to go to the toilet before and after sex to clean your bladder of germs.
8. You will probably be sore for a while after it. It might even hurt to pee because that's what happened to me.
9. Only do what feels comfortable for you. You don't need to go at it like porn stars to impress him. If he's a virgin too, he'll be just as nervous.
10. Don't get pregnant.

Personally i wouldn't do it, and no not because your not married, nobody wait still marriage anymore. I think you shouldn't do it because after it's done your life is going to be ruined. Example: there is a girl at my school,we'll call her "Sarah" . Shes pretty cute and really sweet, great personality and everything but she is disliked by almost everyone in school because she had sex with a freshman in 8Th grade. everyone trash talks about her(even her own "friends" behind her back) and all the guys think shes disgusting and she can't get a guy to go on a single date with her. But wait, she didn't tell anyone about it so how did every one find out... the guy she had sex with. you cant trust us guys. if something like that happens first he'll tell his close friends and tell them to promise not to tell but, once Again you can't trust us guys so sooner or later his friends will tell everyone. ultimately destroying your reputation and you'll end up just like Sarah. so don't have sex now, at least wait until college when everyone else has had sex and you won't be singled out. and obviously don't forget a condom if i still haven't convinced you to change your mind!