A CLARIFICATION, since I realize that, at different points in the video, it sounds as if I'm giving contradictory advice ("only do a PhD if you are certain it's your dream" VS "it's OK to be undecided and hesitant"). What I meant to say is,
It's OK to THINK that academia (or anything, really) is your dream, without being 100% certain about it. (As with anything in life, uncertainty is a sign of awareness it's blind conviction that you should fear);
Definitely do not embark on a PhD if you see academia as your Plan B, fallback plan, or side hustle. It's not going to work out.

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