cleanliness

Sometimes I feel uncomfortable living in Japan.
They say that Japanese people (1) are clean and neat. It is true, but I think they are too much clean (2) sometimes.

For example,: when I open the door of my car and my hands are full, I put the car keys in my mouth for a very short time.

But However, (3) my female friends never fail to say saying “ew, yuck!!”

What is the problem with that?? I’ve never put it the keys into the toilet bowl (excuse me if you are eating), and I never keep it them in garbage box!!!
Every time when I am criticized for trivial matter like this, I feel I am an irregular as a Japanese person.
Is it too much of a dirty thing to put car keys in one’s mouth???

(1) You should clarify by saying "Japanese people."

(2) You should clarify by saying "too clean."

(3) You cannot start a sentence with "but."  Use "however" instead.

Cleanliness

Sometimes I feel uncomfortable living in Japan. They say Japanese are clean and neat. It This is true, but I think they sometimes are too much sometimes. For example when I open the door of my car and while my hands are full, I put the car key in my mouth for a very short time. But My female friends never fail to saying “ew, yuck!!”
What is the problem with that?? I’ve never put it the key into toilet bowl (excuse me if you are eating), or never keep it in garbage bin box!!!
Every time Everytime when I am criticized for trivial matters like these this, I feel that I am an irregular as no longer a 1Japanese.
Is it too much a dirty thing habit to put car key in one’s mouth???

I am on this one with you.  Though putting the car key in your mouth may be unsanitary, it is not life threatening and you have a legitimate excuse to do so.  I would say, anything going in extreme is never good.  I hate to say,  I would like to ask your female friends what do they do if the run out of toilet paper.  Oops, let me rephrase that, since they don't use toilet paper.  They use some kind of pidet.  I would like to ask them what would they do if they couldn't find any toilet paper in a foreign country?  Everything has its time and place.  If you don't see it, you will never know it's dirty.  You never know where my hand was when you shook mine :)

1.  I am assuming you are Japanese.  If you are not, then I would say, "...that I am a freak".