A lot of time professors will ask you "What are you passionate about?" to get you excited about doing research. But what if you don't know what you're passionate about? Professor Bea has a solution: rather than focusing on what you're passionate about, focus on what pisses you off. Mad Pluto's not a planet anymore? Mad Flint, MI still doesn't have clean water? Mad about continuity errors in the Marvel Cinematic Universe? Start there!
When you're researching, remember that you might have to revisit your topic, broaden the scope of your question, or take things in unexpected directions! There's not straight line to doing research, so let your curiosity take over.