Ds21 behaving like a teen. Anyone else?

[winterpastasalad]

Ds21 was the model child, pupil and all round great kid/teen. Did really well in school, worked from age of 14 (on a Saturday), saved money. Wasn't really interested much in forging a social life, but had plenty of friends.
After A levels he had a gap year as he didn't know what he wanted to do, and things have gone down hill from there. He started a (very competitive) uni course, did no work for it (as "studying is boring) and started getting very pie in the sky ideas about making a career out of a competive sport that he started weeks earlier. Dropped out of that course and started another (competitive) one. Says he hates it and wants to drop out as" university is a waste of time".
His attitude with us has become appalling. He's rude, constantly rolls his eyes, barely converses with us and seems angry to be in our presence. He's out with friends constantly. It just seems that he's become the stereotypical teen about 7 years late. He doesn't drink/smoke and I really don't think he's taking drugs.
Can anyone relate and give me some hope that this is just a phase?

Has he said what his plans are if he does drop out again? Is he currently living with you? Is he planning on moving back?

I'm just wondering too if there's something going on in Uni? Has he failed some exams? Not doing as well as he thought that he would?

Similar here with DS19.

He was a perfect child for 17.5 years but making up for it now ...

If he wants to give up uni, let him.

He would need to be getting a job and I would put a time limit on this. And then I would be charging him rent and giving him no money going forward

Thanks for the replies and @JenniJennyJeni sorry you can relate! Yes still lives at home, his room is a tip. We bought him a car for his 18th (he was still lovely then) but recently he used all of his savings and small inheritance (that was supposed to be for a deposit) and bought a rather flash car that is expensive to run. I told him recently I cannot afford to give him money any more, he'll have to use his student loan and work. It transpires he's applied and got credit cards to "build up his credit score" .
He started a sport that has a stereotypical 'rough' demograph where they all think he's a genius because he's at university. I get the feeling a few of them have dodgy means and he sees them and thinks four years in uni is such a waste of time. It's such a shame to see such a bright person seem to resent everything.

I feel your pain. DD is 23 yr. Done the uni thing, the gap year thing, constantly battling with tip of a room. You are not alone.

Why do you think he isn't involved with drugs? It would be my first suspicion, especially given the new friends and flashier lifestyle.

@SoShallINever he's very health conscious and doesn't even smoke or drink, so whilst I can't completely rule it out, it wouldnt be a major concern.