remind yourself every day of your good qualities, the things you like about yourself.
I've been told to stand in front my my mirror and tell myself three things i like about myself everyday.
But I cant face me...so that never happens. it *might* be effective though.

Find something u enjoy and do it.

start with Legos

Poop a lot

Get involved with projects. Take a look at the results. You'll see the effect and be happy.....at least that worked for me.