...Jennifer - Aren't you confusing and mixing gender identity with sexual identity? Your sexual identity is physically fixed, as for most of us - but your gender identity is not just (or even) your physical form; it is what goes on in your persona and is about who you are.
Correct me if I'm wrong, but you struggled with an internal conflict regarding your dressing for many years until you just had to come out your SO and you also had a real need to take your feminine side out into public... if that isn't a sign of even mild gender dysphoria, then I don't know how else you'd explain it?
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