I don't relate to being a particularly "loyal" or "trustworthy" person, to be completely honest. I have let people down before just so I can stay in my own bubble. I don't know how to take the word "trustworthy". I suppose I am trustworthy, technically? I don't try to screw people over. At the same time, I do nothing to appear to be either loyal or trustworthy, nor do I highly value those traits in general. That's why I didn't pick them.
The only thing I could vaguely relate to was "self-doubting", though this word doesn't truly hit the mark. I can be reticent, insecure about the way I look, and see myself in a worse light than necessary. But I don't really doubt myself when it comes to my abilities or knowing something to be true. This has become quite obvious on this forum, haha. People accuse me of being "too sure of myself". This is rather anti-6. 6s are never "really sure".
I also cannot relate to having "authority issues". I can only vaguely think about what it means. I've had my struggles with my Conflictor father, but I never saw him as an oppressive authority figure per se. I just saw him as someone who was against me or didn't understand me. I've never extrapolated my conflicts with him on finding an issue with authority in general. I tested as "Pro-Government" in the recent political orientation test. "Pro" is a strong word, but it reflects that I don't have any issues with authority per se. As far as I know, Counterphobic 6s find the most issue with authorities of any kind.
I'm still inclined to believe you are the Seeker tritype.
I understand your perspective, and you are surely a "withdrawn" kind of person:
4 and 9 are withdrawn, add being an introvert and SO blindspot to the mix, and you'll feel Triple Withdrawn alright.
I do not doubt you are 4w5.
This is probably another factor as to why you can relate more to 5 than 6.
But again, you seem to have certain traits that point at 6 in the tritype.
Ofc this is just my impression, and I respect your own take on your tritype.