Be brave

Dear Carla,

I have decided to write to you this letter because we need to speak.
I'm tired of you!
STOP complaining!
STOP saying 'I can't'!
STOP being anxious!
STOP being afraid!
I can't stand you anymore! Every day it is the same old story: your fear blocks you as a physical paralysis and you can't move, think or breathe... Listen to me: be brave!
There isn't time for whimpering... life is so brief!
What was the moment when you lost all your confidence, when you decided that the others were better than you...ever...and why?
I want you to remember that you have to feel like doing things, and that you have a lot of dreams to realize...
'If you want something, go and get it!' said Will Smith in 'The Pursuit of Happiness'.
You are maybe thinking 'It is only a movie', and I only want to say to you: 'Maybe not...'

Be brave

Dear Carla,

I have decided to write to you this letter because we need to speak I need to tell you something.

"Because we need to speak" sounds like you want to make an appointment.

I'm tired of you!
STOP to complaining!
STOP to saying 'I can't'!
STOP to being anxious!
STOP to being afraid!

"Stop to say" (for example) has the opposite meaning of what you intended.

I can't stand you anymore! Every day it is the same old story: your fear blocks you as a physical paralysis and you are so immobilized by fear that you can't move, think or breathe. Listen to me: be brave!
There is no time for whimpering... the life is so brief!
When was the exact moment when you lost all yours confidence, when you decided that the others were better than you... ever...and why?
I want to remind you that you have the urge to take action and a lot of dreams to realize...
'If you want something, go and get it!' as Will Smith said in 'The Pursuit of Happyness'.

Yes, the movie title has a deliberate misspelling.

I've rewritten some phrases so they sound more natural.

You may be are thinking it's only a movie', but I only want to say to you, 'Maybe not...'

This was actually a good effort - keep going! :)