我在正中间用英语怎么说啊

I'm in the middle exactly

Is between

i'm right in the middle

between 指两者之间 超过两个就比较少用了
for example, I am between A and B, my car is parked between John's and Peter's.

正中间
I am in the middle of....
or I am at the centre of....
看情况而用
for example:
I am in the middle of the train...
I am at the centre of the city

如要强调正中间
I am at the very middle of....
or I am exactly at the middle of....

hope this can help.

I'm in the middle of!