Steering a boat with a toothpick

I do not believe that life is fated. I think that my life happens in a way that would reflect my choices. At the same time however, I think that every other person in the universe governs their life through their own choices as well. This clash of will is ironic because since everyone has choice, nobody truly has control. The complex interactions between everyone’s choices create a kind of chaos. And just like any chaos: one can not be certain of its inner-workings, only the initial state and the end product—like throwing a pebble into a river.
For instance: Bob chooses to go to the movies, but when he gets there everything is sold out. Several hundred other people chose to do the same thing and that prevented Bob from following through on his choice. Now Bob is mad and he chooses to rushes out of the theater and throw something (Bob is not very patient). He chooses to throw a rock, and he chooses to throw it in a certain direction. The rock hits a car and now the owner of the car chooses to go exchange a few harsh words with Bob. Bob chooses to run away and the story continues. The story could have been told from the point of view of the car owner and his day also would not have gone as he had chosen. The complex ‘equation’ that everyone’s choices get factored into so dilutes each individual choice, that it seems random: creating something that could be described as fate by one who believes that there is an omniscient being out there.
In Oedipus’s case it is for the author to decide (or one could take it a step further and say ‘since he is a character, the author had his fate in store for him all along’). Since I have not finished the play I can not be certain, but it seems that the Gods have planned it and Tiresias has known all along: making fate the most obvious answer.