Hello Stefany.  Your meaning was very clear.  I changed some of the words to say it in a way that sounded more natural to me.

Please note that we don't write "wanna" (except perhaps in extremely casual situations, such as a text message to a good friend). 

Nice job with the way you expressed your ideas in this piece of writing!

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Troubles of the children.

I listened to some people speaking about the life of children.
They say that their life is the best, because they don't have troubles. But if they don't have time to play, that probably is a trouble to them. If they can't see their friends, that is a trouble too. Or if they don't have their favorite color to paint that drawing that they made three minutes ago. That feeling so deep in their heart, so cold, so sad, so irritating, so strong... that is their trouble.
I think it is more serious than our work troubles or our economy troubles. I wanna want to say, those feeling of those children are the reflection of when someday they will be adults.
So, why should we permit that they grow insecure about themselves?

Children's troubles

I listened to some personstalking about children's lives.
They said that their life is the best because they have no troubles. But, having no time to play is probably a trouble to them, not to see their friends is a trouble, too. Or not having their favorite color to paint that drawing they made three minutes ago. That feeling so deep in their heart, so cold, so sad, so irritable, so strong... that is their trouble. 

I think that theirs are more serious than our work troubles or our economic troubles. I want to say that those childish feelings reflect the day when someday they will be adults.
So, why should we permit them to grow insecure of themselves?

Very well written!