It seems to me like pre-CBT, you felt intense upset at understandably upsetting things, and post-CBT you're somehow using these new ways of thinking to invalidate your own feelings and points of view. I don't believe that's the effect CBT is designed to have. This is clearly upsetting you.

There is something in this. The previous negative bias was I think a more realistic way of seeing the world, but a positive, almost self serving bias is a more comfortable but less accurate perception. I too am sure CBT is not meant to do this, but of course everyone is different and the effect will be different on different personalities.

People's comments and observations here are all helpful in understanding what I feel.