Is it normal to always think of this?

I always think about how i met people and if it was fate/destiny. if i didnt know him then i wouldnt have met her then i wouldnt of had a gf for so long and i wouldnt have met her friends who had a brother who smoked weed and then i wouldnt have tried weed and then i wouldnt have loved it and i wouldnt be a pot head etc hahah its crazy how many options and possibilities our life has.. ahhhhhhhhhh