If people felt bad when they were overweight, we wouldn't have an obesity epidemic!
To quote
@Dan John, the goal is to keep the goal, the goal. Your goal is to improve your health, and the main way you're planning to get there is by losing weight. So, diet is the first order of business, and exercise to support fat loss and overall health and don't have any other immediate exercise goals besides those. My guess is that a good amount of walking should be your base, and a minimalist strength program of some sort to go along with that.
As far as diet goes, I am personally a fan of what
@Fabio Zonin has called a "jolly day" in his article on body composition here. Tim Ferriss advocates something similar. If you'll forgive a flawed comparison, one can become a more spiritual person without moving into a monastery, and one can improve one's health and diet and still be allowed to have a drink or a few slices of pizza, just keep the latter group of foods in moderation and, perhaps most important, keep the feeling of being in control of yourself - have the drink or the pizza when you decide it's in keeping with your goals, and when it's not, toughen up and just say no to those things.
JMO, YMMV.
-S-