Excellent, good for you!!
I was exactly the same.Its such a good feeling taking part in something so worthwhile, it was life changing for me not to mention the exercise is a great workout.
As for competition I just got quite lucky when I was a 2 tab white belt and I beat one of our national team Black belts in a friendly kumite, so from then on I was hooked and my Sensei's started pushing me towards it.I actually got my first trophy in that fight, not for winning but for 'showing true fighting spirit'. I was training hard and going through gradings and when I got to purple 2 started competing.
I would love to go back to it but im disabled now and riddled with arthritis, its amazing how things change.
It's all good though
Shotokan
Oh wow...I'm sorry to hear that, but I'm glad you had the chance to do it, and enjoy it so much, and yep, Karate Kid also got me started!!