Am I too young to watch The Melancholy of Haruhi Suzumiya?

You can watch it!
The only sexual stuff in it are that Haruhi forces Mikuru to change but they don't show that process, because they kick Kyon the boy, out and the view shifts along with him(bringing us out into the hall). But sometimes their costumes are quite revealing and erm, Haruhi tends to undress Mikuru and 'rape' her. I don't know I that's fine with you but note that they do not show any hentai, only stuff like panties... Mikuru is really the only one who usually is used to show that type of stuff.
^^' It's up to you now, I've explained in a pretty crappy way but I hope I helped...

It has the ecchi aspect without actually showing any ecchi. Well, from what I've seen anyway. Haruhi has the tendency to touch and fondle Mikuru every chance she gets, mainly being her breasts (which is nearly most of the time). A good 90% of animê is basically hentai without being overly hardcore.

I only watched a few episodes. I remember Haruhi dressing like a playboy bunny & some girl-on-girl breast grabbing. That's probably as bad as it gets (unless you find Haruhi's being an "Alice from Resident Evil" Mary Sue to be a far bigger offence).

the Melancholy of Haruhi Suzumiya doesnotreally contain any thing like sex, porn or hentai.Even though Haruhi likes to touch Mikuru's boobs, you will never really see them