I went to marriage therapy once and the therapist basically told me after the first session I was dismissive/avoidant and it changed my life... everything finally made sense!
I have learned to accept it about myself and not try to compare myself to others as this just makes me feel like a freak. Attachment styles come from early childhood experiences so don’t really change much...although awareness helps self destructive behaviours and aids understanding for both partners.
I give people fair warning that I am not much of an emotional person and I need my space and independence (I literally mean NEED, I find any kind of clinginess and over emotional people/situations suffocating). It doesn’t make me a horrible person, but I can’t see how it would really work with anyone but an understanding securely attached style. I think a dismissive/dismissive would never get past a first date!
Although I am crap at emotional stuff I am good at practical matters, great at honest, logical advice, can see the big picture, etc. So it’s not all bad!
There are some good videos about avoidant attachments on YouTube, it really helped my husband understand me much better. Even though I hate to admit it much of avoidance comes from a deep rooted fear of rejection, to be vulnerable is a terrifying thing. Being independent and fearing nothing means nobody can hurt you - a powerful but ultimately lonely existence. An understanding secure type may be able to provide that safety to finally be vulnerable with enough patience and not taking anything too personally!
Hope that helps!