When you’re in school you’re often stuck with the software they require. No harm in that. Once you’re finished with school you can reevaluate. If you want to be more privacy focused you could make sure you’re only using Gmail for in a Firefox container tab for instance or look into sandboxing it other ways.
For the same reasons don’t worry about keeping Windows on your computer for classes. It’ll get easier when you’re out of college, any job will give you work equipment with the software and tools they make you use and you can keep all personal information out of those. You’ll be able to use what you want on your personal items.
Privacy is important, but not important as passing your classes.