It is entirely to do with physics, because we have no control over the laws of physics, therefore no freedom in whatever is determined by the laws of physics acting within chains of material reactions.
Oh FFS, how many times do you need this explaining to you before you'll stop just mindlessly repeating yourself and attempt an answer? The point is that "you" is a part of chains of cause and effect, otherwise you'd just be doing random stuff.
It's actually impossible for "you" to have any meaningful control, or even take any purposeful action
unless that is the case.
Every single mental event in any chain of thought (conscious or otherwise and physical or otherwise) is either entirely due to all the events that led up to it, or not. If not, then some part of it must be due to nothing that led up to it at all - which is necessarily random.
The mistake you constantly make is in your presumption that anything non material will be subject to the same time dependent chains of cause and effect as material elements.
You think about things and make choices over time, therefore the above logic applies. If you think not, it's about time you came up with a counterargument.
Our consciously driven freedom to control our own thought processes in order to deduce conclusions is proof that we are not entirely subject to the uncontrollable chains of physical cause and effect.
This is just absurd. It isn't proof of any such thing, it isn't even evidence, hell, it isn't even a vague hint that your conclusion might might have some small chance of being true.
Control certainly exists in our human brains. It certainly comprises chains of physically defined cause and effect. And it certainly has a source - which is not just another physical reaction but a consciously invoked event.
Baseless assertion and false dichotomy.