I can only relate to what I have done.

I'm insecure/ avoident attached . I have suppressed emotions my whole life as it was ingrained in me. I mimicked characteristics of ASPD because that's what I thought I was. I've been in deep therapy for a while now and realize that as I have been putting in the work to change and rewire, I do have an emotional well. I'm finding it harder to shut down emotionally. I used to be able to power down all emotion very easily.

It takes practice to identify the emotion and to trace it backwards . For example, how can " I'm not mad, I'm disappointed in you " bring me so far down? When I go backwards I can see it. My parents said this to me constantly.

This book could be of some help : Authentic Happiness by Martin Seligman, Ph.D

The method ABCD could help you in the moment.

Most importantly, you want to change and that is a great thing! I would suggest therapy if you are not already going. Self help is good, but a guide makes the journey easier.