Probably overreacting. There is a much greater chance of you dying on your commute than catching the virus if you are in the US, so the virus has not significantly increased your chances of death. And if you are worried about being a carrier, it is far more likely for you to get the flu, which can also be deadly, so the virus has not significantly increased your risk to others either.

Maybe if the US had tens of thousands of cases it would make more sense, but right now I don't see why anyone in North America should be changing their habits given how small the risk is relative to the things we are already exposed to.