Are you saying that the change your self embodies is causeless (which would violate scientific investigation as we know it) or are you saying that the change the self embodies is entirely self-referential? (Are you a solipsist?)
First off, no, I am not a solipsist. I don't believe that the self is the only thing that exists even if much that is experienced by that self is indeed created by that self. There is a bit more to my thinking than it is possible to render into conventional verbal terms.
I see personality as energy. Energy is action. We are action personified. It is inarguable that we are not affected by our actions. We are continually performing actions and that will never cease to be the case, however, karma does not explain the intricacies of action/reaction accurately, imho. It glosses over far too much. It ignores how the most simple act can have massive consequences and fixates on supposedly "good" actions and "bad" actions. There is no inherent "good and bad", there is only action. Also there is the notion that we are somewhat at the mercy of "past" karma and "past karma" is often used to explain away unfortunate incidents in our current experience.
To my view, experience or being is a vastly more complex array of unending choices and actions. True, we are affected by our choices, but they don't necessarily haunt us from one "lifetime" to another. In theory, we do learn from our choices, so, again, in theory, we do take that inherent knowledge with us into our "next" experience, but I would urge you to not get too hung up on this linear explanation. Time is much more flexible that we have led ourselves to believe.
I don't know if that answers your question, but it should give an idea of where I am coming from however poorly worded I have made it. Hopefully it is a bit clearer than mud.