Can you change yourself?

I came across this really short but thought provoking post at Shekar Kapur's blog.
He mentions that you can change the world, but can you change yourself?

I think that's a very loaded question. But even before that I think its worth asking, do you even know yourself properly before deciding to change yourself? So many people live in this state of false assurance that they know themselves. Many I have known do not end up knowing themselves the whole life and some do so very late in life.

Millions just go through their entire lifetime without any particular knowledge of what they want. Other million will go through without even daring to find a proper answer to what they are. And the rest millions will go through their entire life just with the flow and taking things as life presents itself.

Often I wonder if thats right or wrong. Perhaps it depends on the situations that life puts one in.

Anyway, So have you asked yourself this question?
' Who am I? '

If you have a concrete answer to that, will you be willing to change what you are depending on the situation?