I met a guy last night we danced and had a lot of fun I don't know if he knows that lm trans and Im going to tell him I don't know how to tell him should i just go look I was born with the wrong genitals I'm really a girl I don't know how to tell him and I'm scared his going to hate me and I really like him please help
Imho it's better to tell him soon and be straight to the point about it. The longer you wait, the more hurt you'll be by it if he isn't okay with it. And I feel like saying "I was born with the wrong genitals" is more likely to make him temporarily confused and be like huh? rather than just saying you're trans. Assuming you have his number, just text him and say you enjoyed dancing with him and that you'd want to go again with him, and btw you're trans.
If he likes you then he likes you, and if he doesn't then he doesn't. I know that sounds simple, but it's the truth. It's better to find out sooner rather than later.
I am not a fan of telling everybody straight about it. To be honest I think it's stupid and you put yourself unneccesarily in danger. Be it violence or a reputation shaming campaign. Check out how he feels about it first. If you know that, it's up to you. But remember that relationships can break. And heartbroken people can be very evil.
I sent him a text asking what he thought of transgender people it wasn't the response I was hoping for let's just say I won't be talking to him any more
So at least now you can move on and find a potential one for you. You've given yourself a favour in being straightforward.