Is your action part of a long, unbroken chain of cause-and-effect that stretches back to the moment of your birth?

It is possible that this is a fallacy, because the same logic cannot be applied to the universe in general. If everything is part of an unbroken chain of causes and effects, everything necessarily goes back to the beginning of the universe, which is the cause of everything else, but if so, what caused the beginning of the universe? Has it no cause? So it's something that virtually happened "randomly". Does it have a cause? So what caused that other thing? And so ad infinitum. A point will be reached where there can be no other precedent cause, and therefore everything is equally random.

If the origin of the entire universe, and the cause of all causes, is random, why doubt that many other events, such as those of our will, are also of random origin?

The problem, I think, is in seeing the cause as something that precedes the effect, and not as something that is simultaneous to it. That leads us to many aporias. I talked about it from a presentist perspective a few months ago here.