Has your 18 year old son been this way since young childhood or got this way since becoming a teen? If it is the latter, I imagine therapy would be helpful.
He has always been imature for his age. He is 18 and still does not have his drivers license. He shows little motivation or interest in even getting it.
He breaks school rules that he clearly knows are wrong and will get him in trouble.
He breaks laws, thinks he is smarter than the law, but when I see some of the things he does he is really quite dumb.
He has no problem stealing from his own family for money.
He has issues with drinking and pot.
He will not apologise to people he hurts, he just wants to forget about it and act like it never happened.
He manipulates by trying to throw guilt on others for situations that he put himself in.
He does not think about cause and effect, he just does things on impules because that is what he wants to do without any regard for rules of the house.
On the good side,
Other than some school fights, he is not a violent person.