Harder...

People are often impolite or rude because they "speak first and think later".

So, think first and speak ONLY after you have assessed/evaluated what you want to say.

For example, if you say nothing, then you will never say anything bad... right?

But saying nothing is not possible... so think first and speak only when you know that you are not saying impolite, rude or hurtful words.

Strong men and women don't need to say bad things.

Hope this helps to answer your question...

If you try to look at yourself deeply, you will find “good girl”. I suggest these tips for you:
All what you need is to find your nice soul that is full of politeness and kindness.
Use sorry, please and thank you; these words show how polite you are.
Avoid arguments instead of getting into arguments.
Before talking, there is listening.
Before speaking, there is thinking.

Wish you all the best :)

@Richard, you are more than welcome. Your words are realy like a wisdom.

@Richard,

I agree with you. I think you simply expressed deep thoughts in few words.