You're not pretending to be working towards a better life, you're giving it a try. We're born clueless about what's the best investment in the limited amount of seconds we're blessed to have. Calling experimentation on what life has to offer a "waste of time" means you found no enjoyment in learning this specific subject, nor in the doors it unlocks for you (you could be having an apero on the French Riviera, enjoying great wine and compliments from locals for having invested energies into learning their language; or a well paid job in Geneva; or reading the Count of Montecristo in its original format). While I understand your concern about time economization, I think there's and implied slack in how you test what's best for you. As long as you're actively invested in spending your time, and not just let it vanish one second at a time, I believe any activity is worthy of experimentation.

Otherwise what's the point of not killing oneself - will you fight? Or will you perish like a dog?