read up on Aaron Beck, Albert Ellis and Martin Seligman. I have never done any CBT but have read these three and it makes sense to me.
Change your thoughts, change your emotions, change your actions. TEA.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.