Wheel don't spin freely after installing new brake pad help!

I have the Shimano XTR braking system...decide to install brand new brake pad yesterday and now my wheel don't spin freely anymore without rubbing against the pads....The pads are a lot thicker (obviously) so that narrows the gap between the disc.....is there a way to adjust this or is it normally to put on a ton of KM on the new pads?