I don't remember when I got the calling but I remember being drawn to tarot reading during grad school. I learnt it and then left practicing for a really long time. However during all the downers in my life, I had this feeling that there was a never-ending source of light/energy which kept me going. And despite coming from a rigid family of Brahmins (since you are an Indian, I hope you'd understand it better than our other friends here), I was inclined towards nature worshiping since childhood. Thankfully, my family has been fair to me in acknowledgment and acceptance of my views.
My first brush to wicca and magi and witches came through a Paulo Coelho book - Brida, which I still carry around with me for an instant pick-me-up. It got me interested, as many things described in the tradition there matched to my personal experiences. I studied wicca as a religion for about an year, learning about the roots and passage in the history. However, I was never confident or courageous enough to follow the path.
A significant personal emotional loss recently, made me question myself a few months earlier. And I decided that to be fair to myself and to understand the finer threads of life, to answer my own questions, I need to go beyond the theory and start practicing what I had believed and ignored all these years.
Spells and magick, of course, are brownie points. But on a deeper level, it is more about healing and knowing for me.