Why have I awoken Now?

I am riddled by this question lately and it necessary for my progress on path of Dhamma. My question is, why is it that in this life time I have became obsessively bent to attain *nibbana* while everyone around me is living in total oblivion. I mean if I had so many rebirths in past lives exactly what was I doing all these quantillion lives, was I never told the *dhamma*. If I was told, then why am I not already enlightened. Was I dumb or something all these lives not to have awaken to the truth of suffering? What must have been my mistake all these lives? How can I rectify that mistake so that I can felicitate my *nibbana* in this life?