I also see myself as a "childhood trauma survivor" as Skies has said.
I understand what you are saying Growly about co-workers not having the same struggles. Sometimes I have said to T "other people don't find X really difficult like I do" and T says "Well maybe not, but maybe they have not been through the experiences that you have been through".
I don't think there's necessarily a right or wrong answer about whether something should be called a mental illness. The situation is still the same regardless of how it is defined or labelled. I think Ts are looking at whether or not the label of mental illness is meaningful or helpful for someone.
For me, I struggled with low self esteem and feeling fundamentally flawed and different from other people, and that's why it's helpful to me to realise that the things I struggle with are completely normal and understandable given the circumstances.