Exercise all you want it's what you put in your body that counts so start with a firm low fat no dairy diet and start adding some moderate cardio to start off with exercise
Exercise for loss - The calorie equivalent of pound of fat is a marathon of effort and it's worse than that because only a percentage of exercise effort is drawn from stored fat. Plus when you start a new exercise regime the muscles store glycogen for as much as a month causing water gain so exercise can actually mask several pounds of lose.
Exercise for maintenance - That pound of fat calorie equivalent works well when compared to regain rates. Get up to the point you run 2-3 miles most days and the calories from your exercise program comes close to common regain rates. So exercise does work very well to prevent regain.
Low fat - Triggers endless irresistible hunger in vast numbers of people. Feel free to try it once and see if it works for you but it it does not work for you, and it does not work for the majority of the population, pay no attention to the false propaganda about low fat being healthy. It's only healthy for the people who don't get hungry when doing low fat. The idea that any food item is healthy because it's low fat is on the lips of many people but it is false.
Try several different diet types. Find one that works okay for you. Keep trying on that type. Don't just keep trying and trying on one that fails for you just because most people say it's the only way to go.
If a food makes you more hungry not less, that food isn't good for you. Don't worry about how someone else reacts because different people react to different foods.
Dairy - Problematic for some not for others. Go about two weeks dairy free and see if you notice any change in your health. Probably not. It's hard to tell improving health so even if you do get benefits it's hard to tell. Then add dairy back in and see if you notice any change in your health. Probably not. Only a minority of people in the western world have problems with dairy. But it is easier to notice declining health. If adding dairy back causes problems drop it and never look back.
Try that same pattern with other foods, too. As many people have problems with wheat but don't know it as have problems with dairy but don't know it. In both cases a sizable minority.