It’s not my place to invalidate the way you feel about yourself. Plus, my grasp on sanity is tenuous enough as it is, I’m in no place to judge another lol.
I question whether anyone can remain entirely sane. We all have idiosyncrasies and delusions, and anyone denying they have them would be either a liar or terrifyingly inhuman.
Nearly everyone seems at least slightly crazy to me, definitely including me, but especially neurotypicals.
There’s always the literary alternative:
“In that direction,” the Cat said, waving the right paw 'round, “lives a Hatter; and in that direction,” waving the other paw, “lives a March Hare. Visit either you like; they’re both mad.”
“But I don’t want to go among mad people,” Alice remarked.
“Oh, you can’t help that,” said the Cat; “we’re all mad here. Do you play croquet with the Queen today?”
We all are crazy, and that’s okay. Hang with me and we’ll figure out how to manage it.
In the meantime, I love you and am with you.
(This may be a bit sappy but it applies to friends and lovers alike.)
True friends always bring the hard truths
I’d probably say some shit like, “if you’re really crazy, then how would you know?”