...I feel like, if you understand nuances like ^that, then you're fine. Like, in this day and age (at least in the US), the lingering effects of The Patriarchy are basically it; outside of that, the way a female or male character will speak and act depends much more on situationally-specific details that you can control: lifestyle, upbringing, personality.
I feel like you might be afraid that there's some "secret code" to gender and that if you haven't learned it, people are gonna see through your writing and expose your ignorance...I promise, it's not that complicated. ^^; If it seems like your female and male characters are more alike than different, it's merely because people in general ARE more alike than different, and in a perfect world no one would find this suspicious.
As long as you have a decent amount of variety in your media diet (i.e. plenty of references for how people of different genders are written, even if there aren't many in your IRL life), you're probably seeing everything you need to see. I highly doubt the "breasted boobily" writers are coming up with that nonsense under totally normal circumstances; in fact I'd bet money that they're either so isolated from other media that they have no idea that that's not normal, or they surround themselves entirely with the small subset of writers who DO think it's normal.