In this game I think I mismanaged an invasion in my framework, either by thinking it was a weaker invasion than I thought or by not attacking it correctly.

I've added comments in the game, but the central point is (I may also be wrong about that)

9: play q14. It is better shape with r9. You can ignore the slide with the high move too. Indeed ignoring to play k4 is a common opening in pro games.
13: soft. After k4 white usually enters the lower right corner, so because he took r17 you should develop it: q5 shimari is simple and good. Locally this o15 move is a nice exchange for white and not as severe as other options such as n16 (but n16 is harder to play with r14 low instead of q14 high).

....

55: cap of course
57: does k15 work to both cut and enclose?

Thank you for the reviews. I see I need better reading and that until I get that, everything else is pretty much useless.

I'll consider if I enjoy go enough to do tsumego, which I find deeply boring, or to accept the defeats from people I consider I should be defeating (subconsciously. If I think about it I do understand I'm weaker).

I'm not sure that it was resigning time. Here are a bunch of variations instead of passing at the last move. In all of them, black came out on top. (This of course doesn't exclude the possibility that I missed some better white answers, but... resistance might not be futile!

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Patience, grasshopper.

About the question in move 93, I just wanted to avoid the top connecting through O19.