I hate to lecture.....but I'd worry more about your health and safety and less about how "moronic" you look. I'd ditto the suggestion that you go to a bike shop and try on some helmets. Fit and comfort is key. Having ordered a helmet off the internet once only to have it not fit, I'd recommend buying one from a brick and mortar shop rather than online.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher