I would say that yes, those variables are beyond are control. I would personally go a bit past that and say that everything that happens is simply the inevitable result of what happened before it, a single line of events tracing back to the beginning of things.

https://m.youtube.com/watch?v=WagdzxAH8EQ

this video really made me start thinking about this topic, I highly recommend anyone with an interest in free will watch this

I forget which greek philosopher it was specifically, but their conception of Happiness was closer to that. The greek word “Eudonia” has been loosely translated to mean “happiness,” however it more closely translates to “fulfillment,” “contentment,” etc. So often when some of those greek philosophers were discussing Happiness, they really meant fulfillment, which is very different from what we understand happiness to mean.