If I had realised that a substantial proportion of engineering, as taught at degree level, was maths, I would have considered something else.
I can also remember lots of phrases which always made me suspicious, and seldom brought understanding of the underlying process:
By inspection, this becomes... By substitution we get... Clearly, this reduces to...
The final killer was, "and of course you can finish it yourselves from there". I never could.
When I finally ended up designing electrical propulsion equipment for railway rolling stock, one of the "old school" engineers explained that all that was needed was Ohm's Law, plus 25 years' experience. They were, up to a point, quite right.
Chris