I don't think that living the life you imagine is about getting everything that you wish for, but a journey to find the things you want in places you might not have expected to find them. I think fantasies help us see what it is we want, or what is missing. Maybe yours say that you wish you could enjoy more the food that you can eat, that you can find new activities that will feel good physically.
While there is something to living in the reality of what is one's life, there is room in there to reinvent that reality, to add to it and subtract from it, to reinvent it over and over. What fulfills us when young may look very different from what fulfills us at middle age or older. Letting go of what no longer fulfills us and letting in new things to try out is kind of the rhythm of life.