Your title really sounds more like "I still haven't figured out what I should do with my life: Why I find it hard to sincerely debate what I think my values and aspirations should be". That's ok. Life is not an exam and you're not being graded. Not unless you consent to be, and certainly not against other people's criteria, figure out your own. When you say "performative" and "vicarious", sounds like you're afraid to…
I came here to make this comment. Thank you for writing it so well.
Also excellent: 'Atomic Habits' by James Clear [0] ("four laws of habit change: make it obvious, make it attractive, make it easy, and make it satisfying"). Convert vague intents ("I will find my dream job") into a set of actions ("I will try out/interview people who do N jobs in the next week, then evaluate what I think the pros and cons of each are").
But, start right now with some action, no matter how tiny and inconsequential. Do not spin your wheels.
Chris Williamson also emphasizes how crucial exercise and nutrition are as foundation to anything else.