Transfem

Sounds like you've already taken some great steps!

Of course you're genuine being trans, you are you! You don't need to stress yourself about "transitioning IRL" or outing yourself. Nobody forces you. Whatever you read/hear about other trans people is not a checklist for you, but inspiration, a mere suggestion. You should do what feels right for you, when it feels right for you. If outing yourself to coworkers or family doesn't feel right (yet/ever), just don't.

You don't need to push yourself to bravery. At some point, the consequences of outing yourself might simply feel minor compared to the consequences of not doing so. You might say "I've been called a 'he' my whole life without feeling dysphoric, it can stay that way"; but with each dopamine kick of being called a girl also comes that graving when you're not.

If you think you'd like the benefits of HRT, you can start that before/without outing yourself. If people call you out in your grown chest, they might already be more susceptible to accepting you as a woman. Alternatively go "can we not talk about my body".

Maybe we've all misunderstood your question and you meant to ask if presenting yourself as cis is not genuine? Hmm, well strictly speaking, at least to a certain degree: yes. But it's not malicious, and it's socially accepted.

1. you can decide how you want to present yourself, and you can decide how you want to be addressed. You may decide differently in different contexts (this of not exclusive to gender fluidity buy also applies to closeted trans people). It is valid. Women can just be, they don't need to wear dresses and yell out "in a woman" to be genuine.
2. If being honest is putting yourself in danger of discrimination, you are allowed to be dishonest to the extend necessary to protect yourself. Let's invoke what I call trans-privilege (or queer-privilege, or broadly anti-discrimination): Given the circumstances with society, discrimination, law, and the some culture around the act of outing oneself, you are not expected to be immediately transparent about queerness. You are given leeway to do that on your own terms, to decide the if, when and how. You are allowed to keep introducing yourself as cis with whatever pronouns. It is your right to decide on this, it is not malicious. I don't think I've ever noticed anyone anywhere opposing this privilege/right, so take it for granted and don't feel bad about it. Like, I don't think even conservative idiots have a problem with lack of trans outing.