Grip problem?(i think)

[tfauss]

Lately my swing has started coming together. During my practice sessions, practice rounds, and practice swings, my swing really feels good and i am confident that it will produce a good shot. The only problem is, when i actually stand over the ball and start to swing, my swing feels out wack.

It usually feels like it has to do with my grip. When i get to the top of my backswing, sometimes, the club slides around in my hand and causes all sorts of bad shots to happen(usually snap hooks). When i try to keep the club from sliding around, by taking a shorter backswing and holding on to club more firmly i will chunk and top the ball alot.

Please help. I can play fine by myself, or with freinds casually, but when i am playing in a high school golf match, things never come together for me and i am always struggling with something.

what should i do?

thanks