Masculinity is a spectrum, and I feel that a lot of the time us t-guys (especially pre-T) overdo it. You are a man, despite what anyone thinks or how you are gendered, because it's what's inside that counts—as corny as that may sound, it's nothing but the truth. Heck, I still have friends that slip on the pronouns, but I know they see me as a guy. And even if people don't, I don't care, because it's an easy thing to go "Excuse me?" or "It's 'sir,' actually." People get embarrassed but something about seeing their expressions after they flub is almost confirming, as if they can't believe they got it wrong to begin with.
If you need some little tips that improve overall presentation, try just looking up Hudson's Guide and check out that for help on fashion, male-pattern behaviours, etiquette in certain situations (such as bathrooms and locker rooms, when you're ready for that), etc. You can read about being a man all day long, but you're not going to start acting like 'one of the guys' naturally until you instil yourself with the confidence to walk into situations as a man, with other men, and pick up on those behaviours on your own, and until you find the definition of masculinity that best fits you.
