hey sam;
i'd like to attempt an answer to your question: what is kundalini and do i think (or know whether) that's open in you?
i'm not going to pretend to know for sure how it all works. but my understanding, from my years of self-enquiry and meditation, is that we're all born with open kundalinis. infants have wide-open kundalinis. ancient sages have said that open channel, the kundalini, is like an ethereal or spiritual umbilical cord connecting each of us to the whole, the one life that permeates all.
unfortunately, it seems that the kundalini shuts down, becomes blocked, more or less, through the life. and that robs us of so much, causes many problems. that's why we turn to drugs, alcohol, relations after relations: anything that offers us momentary highs, releases. meditation is a practice, a process meant to reopen that channel while not taking away from all that we've gained as grown-ups. that's why we find meditation so relaxing, even intoxicating and, for lack of a better word, enlightening.
some yogis and meditators live those moments in prolonged and deeply internalized periods, continuously in fact. i cannot know what's happening in another person's so-called inner world. and these concepts all might seem foreign. however, all that to say, in regard to whether the kundalini is open in you to any great degree: i wouldn't be the least surprised.
best wishes, merry christmas and happy new year, to you and yours; nathan.