Boy sent to a mental asylum for teenagers where he falls in love [closed]

I watched one movie when I was a boy, around 18 years ago maybe and I did not know the name nor the name of any actor, even worse it is not a popular movie. I am asking here because years of googling have not worked :). Hope this is the right place.

Here is all the info I recall from the movie:

Movie info:

Drama, Low budget, I saw it on Cinemax. Has some mature content (one boy stabs another). Color.

What the movie is about

It is about a normal teenager who is sent to a mental asylum, or some kind of camp for teenagers with mental conditions (can't remember why). In the asylum there is one of his childhood's friends who is obviously mad (aggressive type), a bully and a girl (I think redhead with freckles) with whom the main character falls in love.

The movie is about his struggle in this place, where he clearly doesn't belong. His relief being the girl who he eventually sleeps with and the movie unfolds when the bully after harassing so much the main character ignites the rage of the main character's friend: He stabs the bully and runs away in a car.

The movie finishes with a touching farewell of the two friends (the crazy one is arrested) and a much more mature main character, whose parents come to pick up and apologize.

Main actor:

A fat teenager, with Hispanic features. I think I saw him in movies of this kind but not as main actor.

Some tips:

The movie had some dialogs/situations that stayed in my mind for so long like:

• The crazy aggressive friend tells him that he is nuts because he set his mother's curtains on fire; the main character replies "but you set your mother on fire"

• The girl doesn't read the love notes she gets and instead uses them as hair-clips

• When the parents come to pick him up he's laying outside in the floor and he says he is "creating a tornado"

That's all I can tell about the movie.. does anyone know it??