I didn’t change major as much as finishing one degree and start another…
Undergrad Civil Engineering - focus on buildings with a bunch of architecture studios thrown in. Designed and built one house (my family’s house). Not impressed.
Undergrad Computer Science. Was working as a computer programmer when I decided to do CompSci. 3 semesters prerequisites or 4 semesters for a BS, chose the BS.
Grad Computer Science. Lots of research work on graphics and natural language.
Gets great job writing software tools (we were about 30 years ahead of our time…)
Tries MS Electrical Engineering part time. Halfway thru realizes hardware/EE is way too hard (the math based classes)
Transfers to product development software at work (sort of career change from software tool development)
Gets MS Human Factors / Interdisciplinary engineering which finally taught me the theory behind what I had been doing the last decade…
I just celebrated my 31th anniversary at work, still writing code and still designing user interfaces…