What is the tone of the last 2 pages in chapter 19 of Great Expectations?

Chapter 19 marks the end of the first stage of Pip's
expectations, and closes as Pip begins his journey to London.  After Pip says goodbye to
Biddy, Joe, and Mrs. Joe, his tone becomes reflective, regretful, and
apprehensive. 

As Pip first leaves his home to set off for
London, he thinks to himself that leaving is easier than he had anticipated it to be. 
However, as he observes the peacefulness of the village and remembers his childhood, he
begins to cry. 

In the last three paragraphs of the
chapter, Pip is reflective and self-aware.  Specifically, he thinks about his
relationship with Joe and realizes that he has been ungrateful and that he is sorry for
it now.  Pip is so overwhelmed by these thoughts, in fact, that he almost turns around a
few time and even imagines that he sees Joe during his
travels:

And
while I was occupied with those deliberations, I would fancy an exact resemblance to Joe
in some man coming along the road towards us, and my heart would beat high.  As if he
could possibly be
there!

Despite Pip's
misgivings and feelings of uncertainty, he ultimately continues on his way to
London:

We
changed again, and yet again, and it was now too late and too far to go back, and I went
on.  And the mists had all solemnly risen now, and the world lay spread before
me.

Dickens establishes Pip's
inner conflicts very early on in the novel, and readers quickly understand Pip to be an
extremely sensitive and pensive character who continually questions his own behavior. 
The last few paragraphs in the chapter are consistent with many others in the novel in
which Pip is reflective, regretful, and apprehensive.