You can always become a better person.  But to do so, you must first accept your flaws.

Celeste talks about this as well.

In your heart you already know this, but dealing with insecurity is never as simple as being a matter of "getting better".  It's about accepting the fact that you are weak, and will fail.

Throughout my upbringing I was steered clear of failure.  My very nature, in fact, as a creature of comfort, is to avoid it.  That is only human, after all.  But from time to time it becomes necessary to stand up against -- no, to accept -- that fear.  The dark side of yourself that you so violently tried to push away.  You may not think that your weakness is a vital part of you, but it is something that you need to bring along with you as you move forward.

What is it that I can do?  Where is it that I went wrong?  It is difficult to move forward, when all you see are mistakes.  During these times, I find that I latch onto a spark.  A small idea, no matter how quaint, that gives me hope that the future, though dark, might be slightly warmer.

It is painful to realize that you have made a mistake, even if the "mistake" was to simply not do anything at all.  But my high school self knows that this is but a springboard to launch myself into a sense of conviction.  To do the things that I can.  Small, insignificant things, but they are mine and mine alone.

And I trust that I will follow through.  I always have, after all.  That is simply what it means to be me.  To follow through, until the very end.  Even if I fail, I will not forget.  You must not ever forget.  The promises of your past depend on you, and no one else.