It's true, your metabolism is not shot. That's not what happens. So for you to lose weight, it won't be any different than anyone else. To lose you must burn more calories than you consume. You are obviously serious about it and so I suggest you do the following:
1. You don't need to start exercise right now. Instead, you can start once you lose some weight. Too may changes all at once can be tough. You'll lose weight without exercise once you cut back your calories. Exercise burns calories, it will keep you fit and strong, and it's the best predictor of keeping your weight off, but to lose, you can do it by reducing calories without exercise.
So I suggest you follow these suggestions.
2. For the next week write down every single morsel of food you eat, and every ounce of beverage with calories you drink. Estimate the portion sizes as accurately as possible, and weigh and measure everything. Get a food scale and measuring cup to do it accurately.
3. Go to the following site to figure out how many calories you are consuming
http://www.webmd.com/diet/healthtool-food-calorie-counter 4. Go to this site to estimate how many calories you burn all day (called the 24-hour energy expenditure (24-hrEE)
www.webmd.com/diet/healthtool-fitness-calorie-counter
5. Then here
http://www.webmd.com/diet/healthtool-metabolism-calculator to estimate your metabolic rate. Use the "Inactive" activity level for an additional cushion for underestimation of calorie intake.
Once you know your 24-hrEE, and how many calories you consume, you can modify your intake accordingly, and/or increase exercise, so that you burn more than you consume. For instance, if you consume 2000 calories in a day and burn 1500, then you know you have to either cut back on your calories and/or increase your exercise to turn it around.
If all of this is too confusing, then just do #2 and write down everything you eat. If you do just that you'll lose weight.
Post your diet-related questions to the Diet Community:
http://exchanges.webmd.com/diet-exchangeFinally, I suggest you check out the Diet Community and the Weight Loss Clubs. The support and guidance will be extremely helpful, even if you have your fianc? as help.
Here are the diet clubs based on how much weight you want to lose.
http://exchanges.webmd.com/dieting-club-10-25-lbs-exchangehttp://exchanges.webmd.com/dieting-club-25-50-lbs-exchangeYou'll find everything you need to lose weight on these sites. Feel free to post back if you have any questions.
Take care, Rich