Yes LeQueen - wait until you have your own! And girls too - all that door slamming, all those dramatic tears, all that self-loathing!
I know loads of teens due to having several myself ( - well, one is 12, but nearly there) and they are a widely varying bunch. I am please to report that many are just as LeQueen says. One of my own, in fact, although he is thoughtful, polite and responsible, well spoken etc., to the outside world, but he can still be grumpy, curmudgeonly, lazy and vague at home. and he is intensely private and self-contained which can make me feel shut out at times.
The middle one (16.6) is less unappealing at the moment. He doesn't mean to be , and indeed he is a bit bewildered if we tell him he is being selfish or aggressive, or grunty and scowly - he doesn't know he's doing it. He has perfected the art of talking almost entirely without consonants, and garbling his words into an unpunctuated stream of undeciferable, barely audible lower register mumbling, which is something my eldest never did, and it just pushes all the wrong buttons in me. Having said that, he is a much more 'open', heart on his sleeve type person than the older one, so although he drives me nuts, I can at least 'read' him, and he will talk to me.
He's having more than a bit of teenaged angst, lack of direction, lack of application and self-discipline etc, but I'm sure this too shall pass. If I don't kill him first, he will eventually be a lovely decent young man, because the older male role models around him are lovely decent men. He used to have the sunniest, most easy-going disposition ever as a small boy - it's funny how they change in ways you never anticipated. I know he still needs lots of affection and mummy cuddles though, and in amongst all the hand-wringing and shouting we still manage to lay down our arms and do that from time to time, so all is not lost.
12 year old is starting to have the beginnings of teenaged strops - lots of angry shouting and door slamming over nothing in particular, but I think he'll be ok. I'd like to think there will be no major issues with him, but who knows what puberty will bring?