Effalump I am not sure where you get your masks, but the ones I buy, and make fit closely round the face.
Nothing is perfect but you, like many others of your ilk, are rejecting the better than anything else in search of the perfect. A perfect mask, would kill you anyway, because if there is no way the air you breathe out can escape, then there is no way you can breath air in.
An ordinary mask that will certainly protect you from having your face washed in the particulate matter an infected person will produce and reduce the amount of infection that reaches you and protects others, equally from you. The main way that the virus infects people is through breathing it in through the nose, yes, a few may have contacted it through touching something or through their eyes, but ordinary masks can still reduce the amountof infection in the air significantly.