My son is depressed

How do we ever manage to survive the preteen year.  And if we survive these, how do we survive the teen years.
Who is to blame?  Teachers?  The school system?  Not really fair is it?  They are just doing a job.

So to my son.  Looking at him tonight before bed--I thought he was just tired.  That's why he was a bit pale and his eyes were starting to water.
"What's wrong?"
"Nothing"
"you sure?"
"Yes"
"Ok, what is really wrong?"
"Same stuff I've told you about 100 times."
"Just because you've told me about it doesn't mean it's not importiant."

And that's all I could give except hugs and "it will be ok."