After writing the above, I read some more of your writings and now I want to talk about a bit more.
Your list of reasons for thinking you might be trans are troubling to me, so let's look at them.
1. Euphoria when I see myself dressed (not always)
Look closely at this. Why euphoria? Why not a "finally, this is what's right" sense of relief? Be sure it's not just about "the look" - which could be CD.
Euphoria is the right word. I wasn't expecting the visceral, immediate sense of "rightness" when I saw myself. First time I ever felt that way. Electric. So I do consider this gender euphoria. I then googled to name this new sensation which led me to where I am now - this was key to me. It was more than just thinking I looked ok because I didn't - hairy body, no makeup or wig
2. A quiet voice saying "you're a woman" when I stripped away all the female clothing, mannerisms and behaviours and asked myself "why".
Now, this one I can't and won't argue against. An inner knowing is just that - a knowing. Just be sure it's your voice in your head, not someone elses.
3. I enjoy the comfort of wearing a bra - most days - it's like a hug. That could just be lack of mothering.
Sorry, but this sounds more CD than T*.
There's an old joke that goes "a CD can't wait to get home and put on her bra. A Trans woman can't wait to get home and take off her bra."
It's the hug that it gives mem but that's not CD or TG. My wife dislikes bras so I understand what you're saying
4. I am enjoying wearing a blouse in private. OK, just CD.
You said it this time, not me.
5. A yearning to start HRT.
OK - but why? What do you expect to get from it? Have you weighed the pros AND the cons? This is where the counsellors come into play and I'll bow out and not say anything more
Why? To know peace (hopefully). I'd start it as a limited time trial of one to three months. If I feel nothing (or worse) then I'll know I'm NOT transgender but if I feel better as many many trans people do then it will give me so much confidence. It'd be a trial for the mental improvements not for physical changes
6. I like feeling my boobs (just pecs and fat!) through my bra - there's a surge of relaxation and calm. I know cis women don't go fondling themselves!
Again - this sounds more like CD than trans. Bras are (to women) primarily a "necessary evil" and not a big deal.
Again, I know women don't love bras, but it's not the knowledge or feel of the bra (I actually prefer the feel of a plain cotton bra) it's a similar electricity I feel when seeing myself dressed sometimes - the gender euphoria is the best I can describe it
7. Other things like loving women's clothes, wanting to look like women, wanting to walk down the street arm in arm with other women, wanting to be in women's company, disliking toxic men.
About the only trans indication in this list it the phrase "other women", but even here it seems like it's based on a skewed vision of what women really do. I've only seen women walking arm in arm in commercials (or if they're intoxicated).
Here in the UK it used to be common for women to hold hands and walk arm in arm. I admit it is (sadly IMO) less frequent nowadays.
I'd suggest that you step back, take a deep breath, and examine what you really need to do.
There is no blood test or brain scan or genetic test so everything relies upon my own sense of self, and that is warped by a lifetime of normal living, trying to get on. Knowing myself is hard and is why I've not jumped further yet.