Forget about what you know or how things are in real life.

Your job isn't to document the truth. Your job is to make readers believe in your truth.

The best way I found how to do it is to act them out, aloud.

So while I write, I speak through all dialogue aloud, acting it as if I were acting in a movie, and switching from character to character, changing the tone of my voice, the inflections, even getting up and moving in different ways.

It allows me to inhabit the character completely. 

YOUR voice is the one we want to hear.

There is only YOU, and that YOU wants to be heard. Copying others will only get you so far, and it'll never allow your true YOU to shine. To tell YOUR story.

So tell your story, and tell it YOUR way.

It's not about perfectionism (you can perfect your writing till you're blue in the face and not make it better).

It's about pushing yourself to the limits of what you can do.

You're not alone in this, though it might feel like it.

There were many MANY writers before you, there will be many MANY writers after you, and there are many MANY writers right now struggling with the same thing.

So don't suffer alone and in silence. Ask questions.