Personally I find self diagnosis of autism is valid if you've done the research on it and find you relate (plus when pursuing a diagnosis the assessors tend to want to know what brought you to your conclusion so it's good to have a bit of background knowledge)....
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It didn't suddenly fix anything BUT it gave me reasons & new ways of coping as well as allowing me to give myself some grace and acceptance & to forgive myself when I struggle..
I don't think my BPD diagnosis is wrong or a mistake. I fit all 9 criteria. It's just so undiagnosed in males, and I got really good at stuffing and masking over the years, so it doesn't surprise me it was missed.