You are not destined to be anything you don't decide to be.
You are not destined to be heavy.
You are not destined to be unfit.
You are not destined to be unhealthy
You are not destined to be unhappy.
It is NOT "just the way it is", it's just you've let yourself get off course. It seems hard to navigate when you're not sure which way to go, but finding the right way is much easier then staying lost. You have the controls, you just have to drop your anchor and stop drifting into unhealthy and unhappy. It's time to steer your boat exactly in the direction you want your body and your life to go.
Photo: photo credit: https://www.flickr.com/photos/malingering/1057148318/