You can also tell Siri to use any name you like when referring to "you". It doesn't have to be your name, either.
I suggest that if you do that, you should choose a name that is OK for you to hear Siri say in public.
If you want to find out your own info - Siri knows, so ask her!
Exp.
Ask Siri to "Say my name". She will tell you.
If you don't want THAT name, then ask Siri to use a different name "Call me Batman"
(other questions...)
Where do I live?
What is my phone number?
You can also go to your Contacts, and see what is saved there for your own info. Sometimes you may be surprised what might be stored there. You can edit any wrong info
And, changing your own contact info on your iPhone would be synced to your watch, too.