Finding myself

Hi, I’ve thought that I’m autistic for a few years now but haven’t looked into getting a formal diagnosis. I have a son who is diagnosed and another son waiting for a diagnosis. I have struggled my whole life with anxiety and depression and was always told I was just a half glass empty kind of person. My marriage has recently ended and my wife says that part of the reason is my inability to make changes and not supporting her emotionally. I still don’t understand what she means by this because my understanding of supporting her emotionally I thought I was doing. Is getting a diagnosis as an adult realistically going to change anything for me or should I operate under the pretence that I am? (all my colleagues think I am, friends, my counsellor and all tests I’ve done indicate I’m likely to be autistic)