Self awareness is different from the Self. As I have explained before, when each of us was an infant, we did not have any self awareness, but the Self existed nevertheless.
Self awareness is a mental construction that gets created as we grow up. It is the software that we down load to make the hardware work. This software can sometimes create problems by creating multiple personalities as in DID. Even in normal people different mental conditions can behave almost like different personalities.
I'm happy to take the view that self is different to awareness of self, if that is what you wish. However, in that case, I would suggest that there is no evidence than that the self simply means all the physical things that make up each unique human being, and that this 'self' changes as we progress throughout our life. No problem.
However, when the OP refers to the self as merely an illusion of self, I assumed that this was associated with our own feelings of 'self' which would entail an awareness of what we mean by the word, 'self' as it appertains to each of us. Only in that way can I even begin to understand what the'illusion of self' means.