Hi Alex! (Just trying to help you get used to it!)
I wonder if you can imagine a close friend of yours, going through years and years of torment, bullying, abuse, self confidence issues, the full works, because they had ginger hair (for example)?
They confide in you over the years that they'd love to do something to change the colour of their hair, but they fear the ridicule over changing it, almost as much as they fear the continued damage to their self confidence.
You support them, as friends do, with whatever decision they feel will make them happiest. Eventually, your friend decides to dye their hair blond(e).
They live with their lightened hair for a few years, but it doesn't really feel right for them, but again, they fear ridicule if they were to change it again - they wonder if people will think they're "crazy", or why they didn't just dye it that colour to start with.
Of course, you continue to support your friend. You tell them you do not think they're crazy, you think they should do whatever makes them happy. They are the person whose hair it is, so what other people think of it doesn't matter. Yes, they may get a quick comment the first time people see it; "Oh, you've dyed your hair!", but beyond that, it doesn't affect anyone else.
Your friend dyes their hair brown, and despite feeling that this colour is "right" for them, they are still worried about what other people think.
Wouldn't your advice to your friend be something along the lines of "It's your hair, it's a perfectly normal colour, yes people might notice it's changed, but you don't need to worry about it, you look great!"
Honestly Alex, you are giving this far too much headspace, it's all good, you're not crazy and no one is going to think that you are!