For me it was easy.. Born in Rhodesia and my father took me fishing from the age of 3 and hunting age 6...from then on, it's all History!! 
I guess with me it started with Outdoor life and Field and Stream articles I read as a child who had absolutely no interest in anything but the outdoors. I have always loves hunting and anything to do with the wild. Must be in my DNA.
I have not yet been to Africa but hope to. I am still not interested much in anything but hunting, fishing and the outdoors