I think that 18 year olds in general (there are obviously exceptions) don't necessarily have a good idea of what they want to do. Looking to cultural norms, and asking "Can I see myself doing that" is probably not uncommon in the filtering process of selecting a major.
This seems like a decent survey of the topic (major selection by incoming students), with some references to a few studies at the end.
https://dus.psu.edu/mentor/2013/06/disconnect-choosing-major...
'In contrast with the evidence that first-year students are most likely making uninformed choices when determining a major, the common four-year curriculum path colleges and universities use assumes that students enter college prepared to make a decision regarding major and, ultimately, career path. Unfortunately, the reality is that students are most likely not developmentally prepared to do so.'
There's nothing unique to women here.