Speaking from experience, graduating out of high school and going into college "undecided" is probably the worst move a student can do. I went straight to college as any other high schooler did after graduation, 17 years old, not knowing what to do I just decided to pursue general transfer AA, thinking I'll know what major I'll get by the time I get my AA. Few semesters in, I already lost motivation, I didn't feel a sense of purpose, no drive to go to class, and ended up withdrawing. So I just decided to get whatever job I could get while getting my head straight and figuring out what I want out of college. Few years later when I decided to go back to college knowing what I want, I felt like I had a mission and a sense of purpose, and I think that made me a hell of a better student for it.