If you can't go, but your gf and your friends are going, be prepared for a drunken phone call informing you she's "so so so sorry she got with mitch, and that she didn't even want to but everyone was pressuring her" or something like that. 8) or it could be a secret forever.
but forrrreal, I'm not going to schoolies. It's a lot of money to go to the gold coast or something for a few days and attempt to get with drunk sluts, and probably end up getting your shit stolen or getting rolled by big groups of fobs. Or trying to talk to drunk sluts and then a bunch of white knights come over and are all like "dude! get away from her! she doesn't wanna talk to you, is this guy bothering you baby? Is this guy bothering you?" *pushes you* starts fight.
I can think of better ways to spend my money, spend time with my friends, and mack drunk sluts. therefore schoolies isn't for me.
You can always buy your gf the ol' chastity belt, but that only covers the front. I suppose you could buy another, turn it around and that covers the back. But she's still got hands, mouth and her boobs. So you better go make sure everythings all g.
If I were in your situation I'd just go anyway. Assuming you're 18 you're an adult now, and your parents aren't going to be that mad at you for doing what everyone else's parents let them do anyway. The way to gain independence with parents is to frequently make small rebellions against their rules. Like if you're only allowed to stay out till 11, stay out to 11:30 a few times, stay out till 12 until they don't mention the 11 o clock rule, stay out till 2 with a good excuse and eventually stay out all night. That's what I did anyway. But going to the gold coast is a lot bigger step. But as dude said before, just go. It's a good story. And I think you'll find your parents won't be that mad. Just give them a call every day and let them know you're alright.