When you refer to the I of the past what are you referring to?
Think on this question. What the I of the past is, and how it exists in the present is mostly in the form of a conversation. There is the present where the body is acting, but something is referencing the past in some fashion.
As Douglas Hofstadter says in I Am A Strange Loop:
In the end, we are self-perceiving, self-inventing, locked-in mirages that are little miracles of self-reference.
We are who we are in the present as an illusion which is something like an infinite regress of self-reference. If we ask who we are now, we attempt to find ourselves in the past (everything is past - on the cutting edge of the present, there is nothing), but the me who I would find in the past doesn’t exist in any way that is real. In fact, if I look into the past for a definition, I can imagine a self that exists only in reference to some further past, ad infinitum.
When considering a solid you, that which is considering only finds that there is no such thing. You can find yourself in the present as action, but then there is no you that is inserted between experience and action. There is only doing/being and the one doing/being is not something that has existence apart from the doing / being itself. Self is not a fixed thing that exists with substance. If so, touch it/point to it.
The only place the you from the past has existence is in a conversation about the you from the past. The person you are in the present is not grounded in the past. The you that you are is grounded in the conversation you are having with yourself about reality in the present.
Freud, when speaking about Neurosis, said of the patient:
He is obliged to repeat the repressed material as a contemporary experience instead of, as the physician would prefer to see, remembering it as something belonging to the past
Here, the material of self is not a thread that connects now with the past. The self experiences itself in the present, and is often bound to the illusion that the self in the past exists and has substance.