Why are you ashamed of being a pilot?? Seems odd.
Flying isn't really a private activity IMO, bit of a difference between what you do in the bedroom with your woman and flying a plane around.
I don't have any pilot stickers on my cars for the most part, but I'm proud to be a pilot, I enjoy it and people are interested and ask about it, god knows I didn't get into flying just to talk about it, I got into it to do it, but hey people are interested and it can have some side benefits too, my closing ratio for girls I've taken up is pretty good.
There's a difference between going out of your way to let people know you fly, and being proud, I don't go out of my way to tell someone, but if someone asks what I did last weekend I have zero issue saying I went flying.