I am a failed scientist, how do I get another goal in life? I cannot live without ambition.
So long story short I studied math and physics and my original plan was to somehow apply theoretical physical breakthroughs (condensed matter physics) to solve big problems like energy storage and quantum computing. I even tried my hand at pure mathematics. I dipped my toes in so many fields, but ultimately due to a lack of talent and lack of interest and some healthy dose of mental illness, nothing really stuck.

What I did realize is that I really don't like doing research. It does not fit my personality. I am currently doing a Ph.d in a very applied field of engineering. I am good at it and it is fun. However there is no grand purpose to what I do. I am just making some mechanism of some turbo engines more efficient. It feels a bit insignificant, to be honest.

My question is really, how do I get another goal in life? I feel empty and rudderless without a goal and without some passion to strive towards. Have you gone through such a situation? What did you end up doing in the end?