Before I was a christian I went through a time of depression and very low self-esteem (its still low but not as low as it was). What I found that helped me was taking a piece of paper and writing down all the good things about myself: things I've accomplished, things I am good at, ways that I might have touched people's lives...., and also I would write down things that I considered to be blessings in my life like a good family that loves me, a nice car to drive around, my health, my friends, etc... Write down anything and everything positive no matter how small and I think it will help you see more of the person who you really are, and not the negative viewpoint that is stuck in your mind.
You can include your loving sisters and brothers on CC too
You can include your loving sisters and brothers on CC too