Yay, a fellow Canadian!!!

What province do you live in, and where and when is the competition?
I just recently moved to the US to do a Masters degree, am missing Canada very much, and I understand your feelings about performing. The best thing that I did was constanly play for other people. When I was practicing, especially for my undergrad. recitals, I would haul anyone and everyone into the practice room to listen to me. Right from day one, even when I was sightreading---I had some very patient friends! Then, as I got closer to recitals, I would get even more people to listen. It got so that I was completely comfortable with them, and it didn't stress me out at all. I applied that exact same feeling to when I got on stage.......I would convince myself that I was just playing for those 10 people.
When I was doing my auditions for grad schools, I found I was quite nervous a couple of days before, and then once I actually got to the auditions and was sitting on stage, I realized there was nothing more I could do to improve my situation, so I just let all of my tensions go away, and just played-again like I had know all of these people my entire life.
A big problem I think we have is that we place so much pressure to perform perfectly every time, and that just isn't going to happen. If I am really nervous, I try to get into the mindset that "Hey, I'm doing something really hard, and if people want to judge me for making a mistake, or for it not being the way they wanted it, then let them get up there and play it themselves." You are only human!
My hands too get cold and sweaty, at the same time, its a big wonder to me.......I also have to play right up until the last minute possible, otherwise I feel like I could've done more and that stresses me out during the performance. It's really a mind game you have to play with yourself-like Diabolos said, you have to realize that nothing bad will happen to you up there-and you want people to hear the music that these composers wrote for us. All in all that's what it's about.
Good luck!