Just throwing my opinion out there. Im not going to flame you or anything, so here is my take.
I dont see why you would leave the gun in the car because of your "friends" opinions. Unless its their HOUSE you are going into, what they say has nothing to do with the price of tea in china so to speak (basically it should mean anything to you, it is YOUR SAFETY)
I personally OC about 90-95% of the time. I do not care what people think about it, as it is MY CHOICE and its most comfortable for me. Its like saying that you wont go to the movies or something with your friends because you dont like the way one of them got their hair cut...
Just carry on, business as usual. Once you conceal carry, they will still know you carry and its not going to change things for the exception that they will no longer see it. Out of sight out of mind only goes so far, I found that out. Out of sight goes over GREAT with the general public, but not with people that KNOW you carry all the time.
Either way, +1 to you for carrying and being concerned with your own safety. Always Carry and Stay Safe -