Hi Princess,
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!!