Answering from the top after running and meditating.
How about decision, is there a decision maker ?
I don't see any. Thoughts appear, typing happens.
That said, I find it difficult to look for a decision maker in direct experience, since it seems by observing, the doing seems....... to... pause... or..... stop. (A bit like observing the breathe, can make it change.)
Are choosing what to eat at breakfast ?
(I'm telling a memory now of direct experience.) There were glimpses of awareness: hunger ("sensation"), looking into fridge ("colors"), thought "I want this". Was there a chooser? I couldn't see one.
Are you responsible for something ?
I don't know. There is direct experience, and there's more direct experience, and then there's more direct experience. Things happen.
There are thoughts like
"I need to take care of this body, I need to make sure it gets food and shelter and other needs to function."... I don't know where these thoughts are coming from. Things happen.