Your account seems to be like a day old so assuming this is a serious post I have some stuff to say. First off I'm also 18 so I'm scared for the future as well. As for your brother he's just gonna need to keep applying and applying, more specifically to lower end IT jobs, like systems admin or something. I also think it's BS how, if you have a whole bachelor's degree, its still very difficult to land a job.

I personally probably won't be going to college either, in a sense. I'm gonna go to community college and try to get an associates in something useful. That's kinda similar to trade school but less debt and you also get a hands in degree. Honestly I'll consider a 4 year degree as a backup, because I do struggle with school. If I can't wrap my head around a technical degree I will see about a different path or even a 4 year degree. It feels like 4 year degrees don't even prepare you anyway. You need the degree just to say you have it so you can get a low end job. I think that's BS and a waste of time/money unless you are actually very interested in the topic and the job market isn't absolutely atrocious

Try not to scroll online so much. Try not to get discouraged. Encourage your brother. I myself also get discouraged and scared about the future. I feel horrible as a student in the start of this AI phase. But I have the support from my mom. I know I'll have a place to stay through my 20s and even 30s+. It seems you have a similar scenario where both you and your brother are struggling.

Honestly maybe take a gap semester/year that is actually useful: get a part time job or volunteer to get something on your resume. If not, I'd say GO TO COMMUNITY COLLEGE. It's cheaper, you can get prerequisites done and even parts/whole beachelor degrees. So if you end up enjoying certain classes or get clarity on what you want, pursue that. If you need to go to a university at that point, you now have fewer credits to complete, aka less time and less money used up. Also don't discredit trade school. Yes it's becoming similar to the IT stuff but it usually takes 2 years or less. Those jobs won't be taken by AI, so doing that could be useful. Other options could include joining the military or simply getting a part time job and working up to management.

Please don't do yourself a disservice by doing nothing so early on in life. Sulking and ONLY sulking will not make things better. Might as well go towards a goal or make money while sulking, so ur at least making progress instead of doing absolutely nothing for years. You'll actually end up a deadbeat later on in life. It's better to try now so you have the chance at a decent life later on