I honestly haven't read many of the other posts on this question (sorry!) yet since it's almost midnight but I'll share what I think.
How Pip self identifies is called into question by the influence of Estella and her calling him common and coarse. These words are repeated several times during the first part of Pip's expectations, making the impression that these words had a huge affect on him and are a driving force in him wanting to rise about his lower class status. He didn't know how the other class lived and when he sees the great estate inhabited by Estella and her grandmother, he begins to hate and be ashamed of his own home. The coming into contact of a lower class boy with higher class individuals and a lifestyle cause him to be very conscious of his position.
