I got into the habit of wearing my seatbelt when I learned to drive 37 years ago. From the time our kids were little, they knew that the car did not start until everyone had their belts buckled. It's not an imposition, and it is something that WILL protect you as a driver both wearing your own, and with all the other passengers wearing theirs so they don't become dangerous flying objects in the car if you are in an accident.
I got my license 36 years ago. The only thing the examiner dinged me on was failure to wear a seat belt. We didn't have them in my home town and the thought of using one never even occured to me. Even today I rarely use one.
The dangerous flying passenger is far less frequent than the occasional appearance of Jesus on a dirty window pane; however, it has become a legend.