What I do to build my confidence is to write down one thing I have acheived or that I like about myself each day, it could be something stupid like, I am having a good hair day or I am thinking positively, or it could be something good you did at work or school or anything you can think of.
Sorry to hear that you lost your Mum when you were so young, thats hard. I lost my Dad this year, and it's hard going at times!!
"The Optimist sees the rose and not its thorns; the pessimist stares at the thorns, oblivious of the rose."
"Life isn't about waiting for the storm to pass, its about learning to dance in the rain"