I would never go back to pads or tampons. Although I am not sure when it began, I do remember that I went to an all boys school all the way through and never mixed much with girls before. In addition, when we did visit girls schools for different inter school projects, I had been bullied at school, and I found that when I got to the girls schools I had this idea that they would be nice to me, but the alpha females in the school, who were also very attractive not only joined in with the bullies from my school, but they actually made fun of my body and lack of muscles etc.
I dont know if this is the cause or not, im generally a little shy and anxious socially anyway.