If I take all circumstances into my considerations, all events prove to be necessarily. But I won't think so. I want to determine my course myself. Another opinion is assuming all processes as self-organizing. There are objective chances with a choice between alternatives, but also the possibility to create news.
Time comes into being while irreversible changes of things.
Past is determined, future is undecided open. Present is a short space, in which we decide and create. The means to do something are unevenly distributed. Yes, future is entailed by past. We can see trends and lawfulness of evolution.