This comment is totally and completely accurate.
Right now, I’m mainly anticipating wrapping up this year, but I’m also advising first year students, and have visited with prospective students. They fall into two general categories: 1) the absolutely certain who know exactly where they’re going (lots of pre-meds in this group), and 2) the ones who have no idea, and are worried that they’re supposed to have their whole life planned out by now. I tell (1) to embrace change, find what you love, and do that. I tell (2) that nobody knows what they’re doing, we all wing it as we go along, and have fun finding out where life is going to take you.
It’s not as if I ever knew what I was doing. I’m 65 and still looking forward to surprises.