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As long as I remember I had to put on a seat belt and I just feel uncomfortable without one.

Austria, Germany, and many other European countries enacted seatbelt laws around the mid-1970s. Czechoslovakia appears to have been the first European country to pass such a law, around 1970.

The various Australian states were also early adopters in the 1970-71 period, with New Zealand following soon after (1972, if I recall correctly).

The U.K.'s first mandatory belt law was introduced 1983, and the various U.S. states started implementing them from the end of 1984 onward, but were much slower overall. A large number of states still have only a secondary belt law, not primary (i.e. the law says buckle up, but you can't be stopped and ticketed for it unless you've done something else first, like speeding, running a light etc.).

New Hampshire is the only remaining state in which it's still perfectly legal to drive unbuckled. Live Free or Die! [Linked Image]