Weird problem with key

i have a 2000 nissan micra my weird problem is i can drive my car without a key in the ignition, could this indicate that the car got stolen from previous owner or that my key is worn down so much? fwn i can also start car without key is this common in micra's or is it just mine lol
 
It could be either, Youll find that with a good wiggle most micra keys will fit any micra really, ive had about 8 micras, and with a good wiggle i could use 1 key on them all lol, its just the pins worn down
 
my keys stuk down the ignition lock barrel(all of it)
but car only starts when the other end with nats chip is used to start
 
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