Or you can choose to be unhealthy. Smoking, drinking, drugs, poor diet, lack of exercise. These are by far the biggest contributors to healthcare cost and they cost absolutely nothing to prevent. Many people just don't take responsibility for their health, and many others in the US don't like the idea of subsidizing other people's healthcare for preventable or self-inflicted health complications.
edit: I actually do have access to one of the best single payer systems in the world due to dual citizenship. Single-payer is far from the perfect silver bullet everyone likes to sell it as.