Like I said, leave it in the safe or never holster it.
That being said, stainless often times does not show holster wear as much as does, say, blued steel. Often times you will see a little bit of shine at the edges near the muzzle and the front of the dust cover (that forward portion of the frame underneath the barrel).
Fact is, if you are going to play the games, they require you to insert and remove your gun from the holster at least once per stage. If you expect to become better at them and increase your skill level at all, you will need to practice - a lot. That includes draw drills. Again, lots of holstering.
It's just plain something you're gonna have to get over if you want to actually use the gun.
I know it's your first gun and you want it to look as good as it can for as long as it can. The first one is always the hardest.

Personally, I find pristine guns boring and evidence of not being used. Honest wear from honest use is something to be proud of.
An option that might help to decrease wear is to get some Blue Wonder Armadillo wax. I've used it to help with rust, but seeing as it is a wax and does create a barrier, it might help some. Thing is that it will mostly likely wear off with just a few holsterings, so it's certainly not a perfect solution.