When at 18 or 20, or in my case 24, you fly away on the adventure of a lifetime, you aren't thinking of your future self. When I first winged my way to Australia, I had no inkling where it would lead. Or all the losses it would lead to. For me. For my future husband. For our future children. For our families. Swooping in over Sydney Harbour for the first time more than 20 years ago, I had an ove…