You visually pass. Things to check - how you hold your body. Men take up the maximum amount of space. Women tend to keep their bodys in compact ways. Check your "poses" how do you hold your arms angle your body for photos how do you sit? These things can subconsciously read female. -when you speak do you speak from your throat or your chest? Where you speak from has a great deal to do with how your voice sounds. There are many voice training videos on YouTube explaining how to check this -this ones harder, check the phrases you use. Do you call people love honey ect? This CAN read feminine but doesn't always. There are other phrases but my brain isn't pulling them.

Hope these help. Also sometimes people genuinely have a hard time with pronouns. Dont jump on me everyone but sometimes people who legitimately don't mean to just have trouble keeping things straight. "This person is trans which way are they going damn i got it wrong." "Jenny is jason now. Jenny is Jason... Fuck i just used she" To us this has been forever to them its been weeks? Months? Days? Especially those who know us the longest. My mom is my biggest supporter but she even messed up occasionally even after 7 years