First of all, 30 is not too late to start in this business, although the older you get the rougher it is on the body. Secondly, find a place that you are comfortable with. There are all sorts of great restaurants, most of them without the Michelin stars. There are many people that excel in the fast-paced, stressful, backstabbing world you describe, and others don't. If this place isn't for you then find another place. There are plenty of great chefs out there, the vast majority doing their work without all the awards. Talk to other cooks and chefs and find out the places that they like to eat. Chances are those are places that are putting out great, unpretensious food.
Good luck as you start your new career.
Good luck as you start your new career.