Kingdom of Knuffel

Neither have I

I have never confessed (love) to anyone.

Depends your definition- I've told my boyfriend I love him, but that was after we started dating. So there was no anime-style love confession.

I have never confessed to a priest!

Neither have I!

I have never been to an actual play. (I've only been to the school ones)

I have.

I have never cleaned any windows.

I have.

I have never had a pet ferret.

Me neither, though it must be kinda cool :)

I have never had a really bad, hurtful sunburn (at least since I can remember, don't know about as a small child).

I have. Such...pain...

I have never had a major surgery.

Neither have I.

Actually,
I have never been to a hospital except as a visitor.

I have!

I have never learned to speak another language fluently.