For some reason, tissues are a thing I just like to include in my drawings. It implies...several things, really, that and me being a sneeze fetishist, I like to think the characters always kinda have some near them :p
You are yourself. People have seen tissues in your drawings for years now. Do not feel bad for drawing something you like! =) Plus what you said makes sense. I know a ton of people that keep tissues or handkerchiefs near them or on themselves at all times.
Some people have made alternate accounts specifically for sneezy things on tumblr to make it easier for them to post what they enjoy without fear.
Thank you for showing what you draw =) I enjoy your characters and the things you do, sneezy and non-sneezy.