@maskup, do you want to try wearing a face shield? They are usually worn with the mask, but if you don’t plan to wear a mask, a face shiled would work for you?
from physics POV – it does not restrain oxygen; it unquestionably stops direct droplets, and probably reduces smaller aerosol as airflow goes from the bottom
sociologically – it shows people that you are not brazen and will reduce hillul Hashem and blood pressure for everyone. Also less ayn hara for you fro mbeing cursed by passerbys
psychologically – you’ll prove to yourself that you are not such a lazy bum, but can bother spending $5 on the pandemic