The fact that you're even asking this question is concerning.
Unless you were assured of your own immunity, being the person who unleashes the virus on the world pretty much guarantees that you will be one of the first infected. If not THE first. Which means, yay, you're a zombie, and you've just kickstarted the Zed apocalypse. Can't you find a less dastardly way of committing suicide?
If you were sure of your own immunity to the virus, and just wanted to live in a video game for a while, let me tell you, it would get old really fast.
How about this. Gather up all the camping gear you own, or all the supplies that you would want to use in a Zed apocalypse. Pack them into your car or onto a touring bicycle. Go off into the wilderness by yourself for a week.
drive until your car runs out of petrol, then abandon it because there's no petrol left. (skip this step if you chose the bike)
Eat out of tins, sleep in the dirt, pretend there are zombies around every corner and practice running away from them because, let's face it, you're not going to have a gun or ammunition by this point. For added reality points, camp somewhere with bears like in Alaska or where there are known mountain lions for added danger and adrenaline.
Pick up and go home when you're tired, sore, lonely, and out of food. (Or, get eaten by a bear.)
If you enjoyed it, congrats, you're crazy. Sell your house, buy more camping gear/cycling kit, and live in the woods for the rest of your life.
If you didn't enjoy it, congrats, you're just a regular guy. Go back to your normal life and feel guilty for secretly wanting to kill millions of people just to have a life that seems cool but actually sucks.
Secondly, your assertions are just as much assumptions as mine are, neither of us know what it would really be like.
Thirdly, any Z-Head will tell you that zombies and bears have a number of subtle but key differences. (Zombie bears are an entirely different issue.)
Fourthly, I gave a second option where instead of causing the zombie apocalypse you travel to an alternate reality where it is already happening.
Thus meaning I wouldnt be killing millions of anything.
Leaving aside the patronising video game comments and your "assurances" that it would get old fast (have you lived through one of these before) I still think I'd be tempted by it. There is a fairly significant part of me drawn to the apocalyptic. I think it would put a lot of stuff in perspective.