What is the true nature of the self? Yes, this is a tough one to start off with, but in my view, the true nature of the self goes back to Descartes' 'cogito ergo sum', which means 'I think, therefore, I am'. That is from the 17th Century. What makes this question more interesting these days is the arrival of AI and machines that simulate thought processes.
Let's assume that the machine provides us with a simulation of a thinking being, who can reason, cogitate and think. Once we enter into dialogue with the AI, are we having a real discussion or is it a simulation? Within the boundaries of the simulation could the machine be said to have selfhood? If the machine possesses selfhood or 'subjectivity' how does that relate to ours within the boundaries of the simulation? The true nature of the human self arises, therefore, with respect to its relationship to machinery via technology.
There are many theories about selfhood, but nowadays we have to also take into account the question of whether machines can have true selves, and if not, then why not. Why would it be absolutely impossible for a machine to have a self? If we can first answer that question then we could move on to more precisely describing the nature of our own selves. I think, therefore, I am.