Is it normal that after i eat a kiwi, my mouth burns?

You're probably allergic. I know someone who's allergic to them and she says her mouth and her throat burns before going numb.

Then stop eating New Zealanders

My brother is mildly allergic to pineapples and he says those burn his tongue when he eats them. Maybe not "normal" but it for sure happens. He's had it check out by a doctor.

Kiwi birds are on the "endangered species" list. It's illegal to eat them.
Switch to chickens. That should solve your problem.

It's those New Zealanders they're full of you know what