You must also understand that the kind of math classes they make engineering students take is also not what a math major does. The common thing for engineering

You must also understand that the kind of math classes they make engineering students take is also not what a math major does. The common thing for engineering programs to do is have a special course called something like "linear analysis" that is a rushed computation-heavy mix of linear algebra and calculus/ODEs. It depends on your institution, I'm sure, but I'd be surprised if your experience was a faithful representation of what it would be like to be a math major.