You are different to how I expected it to be.

No, it is not correct. “You are different from how I expected you to be.”
If it were the reverse, it would be “You are similar to how I expected you to be.”

Anonymous Is the sentence below correct and natural? "You are different to how I expected you to be."

It's OK. "different to" is British English; it's rarely heard in American English. "different from" is preferred in AmE.

I'd say: You're not what I expected. or You're different from what I expected. You don't really need the whole c

Thank you. I have one more question:

"The house is different to how I expected it to be." Is it correct?

Anonymous"The house is different to how I expected it to be." Is it correct?

Yes, but as I mentioned, Americans say "from" instead of "to".

CJ