Buddhism on depression? I've seen some posts (questions and answers) talking about how feeling bad... is bad. Basically that you shouldn't feel bad because of... whatever reason. It varies. 

My question is... how does that affect Buddhist teens? You know, the ones controlled by their emotions. Or the ones that are depressed. Will it not act like a Circle of Depresseion, where the person becomes more depressed by thinking that they are a bad Buddhist by being depressed?

Like, you feel sad > you're not supposed to feel sad. You're supposed to be above that > you feel sadder because you are sad and you're not supposed to.

How does newly converted buddhists face that? How does any buddhist face that?

Note that this question talks about laymen, and not munks.
Hmmm that's an interesting take. It's not that feeling bad is bad. That would indeed lead to the vicious circle you describe. It's more like feeling bad is lame. It's like you're starving when your fridge is full. Or you're itching but don't know how to take shower. Or you have cockroaches in the kitchen but don't realize that keeping it clean could solve that. That's the idea.

Per Buddhism, feeling bad is not something we should feel helpless against. Despite life always giving us trouble or even completely failing us in many ways, there are ways to feel good regardless of all that. These Buddhist techniques for feeling good are not fooling oneself, not wearing pink glasses - in fact they are more real than what we're used to call "real".

Having said that, in my experience of having a teenage son (who is now 19) they can sense B.S. from nine miles away, so unless one has really mastered it in one's own life, giving them some fairy-tale explanations is not going to work. But if you have walked the path yourself and know what you're talking about, you can totally help a teenager achieve stability and agency in their own life.