Help me verify please

[FenderStrat]

I'm changing this from first person plural, present tense:
We bite our lips, hide in our rooms, and shudder every few minutes. On the outside, we always act brave, but everyone knows that there is always something we’re scared of…something that makes us instantly look like a coward.

To this in thrid person singular, future:
He will bite his lips, hide in his rooms, and shudder every few minutes. On the outside, he will always act brave, but everyone knows that there is always something he’s scared of…something that will make him instantly look like a coward

Am I on the right track? Is the meaning of what I was saying still the same (not regarding the fact that I changed persons)? Can I use 'mankind' in third person singular?

[David L.]

'we bite', 'we always act brave'

why, 'he will bite' and 'we will always act brave'?