I always wanted to be a physicist. I even got into a Physics program in a decent college. But my dad forced me to go the engineering route and I switched my major. Two decades later, I often wonder what my life would have been if I hadn't done what he told me. Physics is super hard and regardless of my passion and devotion I don't think I would have been very good at it (I can't even do dynamic programming problems asked in coding interviews - so unlikely I would have done any useful research in physics). I would have been languishing as a professor in some unknown college making significantly less money. But the dream hasn't died out though. I still fantasize about being a physicist working on black holes or cosmology. But I have accepted it will forever remain a dream.