As someone who is also active in the "Open Carry" movement (open carrying a defensive handgun, where legal), I can tell you that I am used to strange looks by all kinds of people. But I got over it, because I had the courage of my conviction, I knew what I was doing was legal, and I knew that every time someone would approach me to ask about it, it would be an "educational opportunity" and maybe even a change to make a convert (there are a LOT more people with concealed carry permits than you'd think, and MOST of them don't even know that Open Carry is legal in most states!)
The same goes for "Open Vaping". It is legal. It is not dangerous to anyone. And every time someone asks you about it, it is a FANTASTIC opportunity to educate them and maybe even make a convert to e-cigs.
Get a "patter" down. If you have to make some notes, do that some evening--work out an "elevator pitch", about how e-cigs helped you get of cigarettes, how it is NOT smoking, and where they can go to get a good "Starter kit". Most vendors even have "rewards programs" and will send you business cards that you can put your "referral code" on, so when you make a convert, an they buy from you rreference, you can get credits toward buying stuff!
Have no fear! Vaping is legal. Vaping is good. Vaping saves lives.
Open Vaping is our best tool for making converts, winning the hearts and minds of the general public, and educating people about our "cause". The more people know about vaping, the more they will support us when ANTZ or misinformed poliiticians try to take away our rights.
The awkward feelings will go away after a while, and the more positive educational opportunities you have, the more comfortable you wil become with "Open Vaping".
So, get out there and Vape Openly, and Vape Proudly!