I am way below my driver's license weight as well
..I was honest and told them my weight (way back then).
On another note..here's a recent story of my 28 year old friend who weighs approx 180. We were at the liquor store (booze bags that we are) and she was asked for I.D. She shows her I.D. and the lady stares and stares at it and asks for a second piece of I.D. (first one was expired and friend was about 230). Friend says well I have my older college I.D. here..same info on it..lady stares and stares again..my friend was about 270 in this pic. Lady THEN proceeds to ask her her birth date etc...kinda felt good about it all but felt like "J*&^% just sell me the beer! or let my friend buy it, lol" After about ten minutes she let her buy it. I understand though that she was only doing her job. Just make sure your pic I.D.'s are not too far off your real size, lol
I said to her, "ummm...not only because it's expired but I realllly think after that 3rd degree you definitely need a more accurate picture I.D" lol.....it was hilarious!