I would read it as "My choices have caused me to be here, and I must rely on my choices not to keep me here" That obviously has limits; anything taken literall

I would read it as "My choices have caused me to be here, and I must rely on my choices not to keep me here" That obviously has limits; anything taken literally to an extreme does. For instance, Munger lost a nine year old son to cancer; I doubt he thought "This is my fault, I did this, if only I had acted differently". The central point of the quote is to believe you have agency. That if you are in a situation you do not like, you can act to get out of it. There are times when this isn't true, but if you act as if it is you'll be more likely to get out of such situations. And then you have to use human common sense to know when something is literally impossible. So, back to the example of someone abusive, you might think "it is my fault I am dealing with this person/situation" and consider what actions can get you out. I would distinguish this from victim blaming: First, you are doing it, not an outsider. Second, the point is not to feel shame for yourself, but consider positive actions.