Is there nowhere else for you to stay?I really don't think you should be living with people who chip away at your confidence so much.Stop blaming yourself because if your dads reaction was not going to be a pissed one you would of told him sooner.As for the stuff you did at the age of 3 well that reminds me of my friend putting his mums clothes on her bed and trying to light a match because he wanted a bonfire.

It's never too late to improve your life and make things better you just have to work at it.