The career you end up working in depends chiefly on what you saw as options when you were just starting to enter the workforce. That was a very narrow period of time, during which you were only aware of a limited number of options. You went with whatever made sense at that time. The result — what you do today — is more or less happenstance.
Friends too, are mostly in our lives as defaults. Most of us have found some incredible and inspiring people just by letting happenstance deliver them, but once we have some stable friendships we become complacent and stop actively looking for friends that really resonate with our values and interests, if we ever did at all.
Unless we take the bull by the horns, we end up as products of destiny rather than masters of it. Not saying that’s a bad thing but it does raise the question of how much free will we really have. Again.