Help a mom out

I thought college was when you figured out what you wanted to do. It seems colleges wants kids to decide in middle school and build up a resume in highschool for their adult professions. How r u supposed to know anything at 15.16.17.18. Much less 19. 20. I went to a shitty state school. Majored in English. Had fun. Met my now husband had more fun. Then decided to go to med school. As I went to a mediocre state school classes were not too hard. How do you guys know what you want to do. Most people I knew in college over 90% of them changed majors. Insight from the youth of today. So confused. Feels ridiculous that you guys must go through this process. I suggest a fun major at a mediocre school as this is the last time you can study fun stuff before you have to be an adult. My siblings were music majors at same mediocre state school and are now both surgeons.