My friend stole my fortnite account data and changed the email. Does anyone know how to block or do it?
He is not your friend anymore
We've got it
Unfortunately, no. You'd have to prove to EPIC support that it's YOUR account. Since this is only possible through the stored data, this can't happen.
You should also better protect your account. Keyword 2 factor authentication
Talk to your parents. You should then talk to your friend's parents to clarify everything calmly and factually.