用英语怎么说我一定是疯了才会这么做我想我一定是疯了。。。。用英语怎么说？

\u8bf7\u95ee"\u6211\u4e00\u5b9a\u662f\u75af\u4e86"\u7684\u82f1\u6587\u600e\u4e48\u8bf4??

I must be mad!
I must be insane!
I must be going insane!
I must be crazy!

I think I must be crazy\uff01

I must has gone mad to do that.

I must be mad or I couldn't do that.

I must has been crazy to do that

i must be nut to do that

用英语怎么说 我一定是疯了才会这么做 我想我一定是疯了。。。。用英语怎么说？