I was a psychology major when I started college! I switched to mathematics after the first semester. The psych program at my school was pretty mediocre, and I didn't really get along with the faculty or the other students in the program, so I decided it must not be for me. I am much happier in the math program, but I am still very interested in psychology, neuroscience in particular. I hold a minor in it currently.

I also switched my concentration last semester (the end of my third year) from math education to discrete mathematics, which thankfully didn't delay my graduation even though it significantly changed my career path for after I graduate.