Always be kind to yourself.
When people feel bad, they sometimes talk to themselves unkindly, and beat themselves up. It is important that you know depression is a disease and suffering from it is not your fault. No matter what your doctors, parents, or even random strangers tell you, you are not at fault. Nobody would choose to have depression. What you need right now is a friend, not an enemy. Make sure your words and deeds are gentle and encouraging.