So say we all.
Evolution doesn't make deliberate, strategic choices. Random mutations result in new behaviors/properties that may or may not be beneficial, and selection removes those mutations that prevent reproduction from the gene pool. Not every mutation will be beneficial, but as long as it's not harmful enough to stop reproduction, it can persist.
If there were two groups of octopuses, one with the self-destructive behavior and one without, then there would be pressure from competition. In that situation, your point would have more of an impact. But without that pressure, there's nothing to drive the selection. And the mutation won't occur just because it would be helpful for it to do so - it's random.
At least, that's how I understand it. I'm not a biologist or anything.
I'm just gonna leave this here in case it changes somebody's life: https://medium.com/the-identity-current/plight-of-the-transbian-4ab1a048b09b
For what it's worth, you're far from running out the clock. If you're still in your 20s you have a lot of life left to live and are lucky you've figured this out as early as you have, even if it doesn't seem like it.
I don't know what you've already done, but one approach is to try less extreme measures first and ease into it a bit. Clothes, makeup, mannerisms, pronouns, etc. You could consider stopgap measures like focusing on hair loss prevention/restoration as a way to buy time and feel like you're doing something concrete while you sort your feelings out.
Some of these themes also touch on topics discussed in this post from a while back - you may find some of the discussion helpful: https://lemmy.blahaj.zone/post/4266431
EDIT: Forgot to specify; these are definitely common feelings, if my own experience and internet-binging results are any indication. You'll get through it. ❤️
EDIT2: lol, I didn't see who posted this until now. 😅😭🤣
Absolutely. You wouldn't want to be in front.