When I started to exercise regularly six years ago I immediately noticed that it positively affected how I felt. My brain began feeling less cluttered, physical aches and pains disappeared, and I felt more motivated to complete seemingly difficult tasks. The realization that I'd done something challenging to improve my body spilled over into real life. And the further I traveled along the path, the more I came to view food as fuel.
Even when I do not want to exercise I do it. I simply tell myself that every time I exercise I am doing something positive for my body and long-term health. I cannot imagine how I lived without it now, and will not live a life without it again.
Do yourself a favour and allow yourself to exercise. Do something. Do anything. You will feel better. And that's something you deserve.