Who am 'I'?
I guess that with regard to the unique parts of personal identity, a lot depends on the aspects which are most fundamental, including the genetic components and environmental factors. However, there is so much which comes down to subjective interpretations and meanings. In a way, each of has own sense of internal meanings and narrative stories, which comprise the whole nature of identity. I asked the question, 'Who am 'I', but this also is the 'Who am I? ', which Erik Erikson points to as being the essential part of identity and identity crisis, especially important in adolescence. The whole experience of exploration during adolescence is about experimentation, and even rebellion.
So, personal identity is about finding a unique path in life and links to the issue of 'Know Thyself' and authenticity. This involves the existential aspects of life choices. Also, it may be that one knows who one is more in retrospect than in an advance, because it may be that many of the acts which the person does may be spontaneous and may be different from the way they would have imagined they would have acted. So, while the question of the sense of identity involves the ongoing sense of becoming, this also involves assimilation of previous choices and integration of this as an ongoing fluid sense of the ''I' of existence.