My 18yo son is a college freshman. He is not an aspie, but he has many traits of one and matches the rest of your description perfectly. He is currently living at home and attending a nearby large public university. This first semester has been eye-opening.
I am just coming to grips with the above. 100% true.
It is so different to experience and live this truth rather than just contemplate it. On the plus side, my son got a job and has been working since June. He worked a large number of hours this semester; it definitely hurt his grades. He also chose to play video games, not eat well, not sleep enough, stop taking his ADD medication, and barely study. Going from homeschool to college was a HUGE shock for him. I was much more difficult than I would have guessed. You are right to be concerned. My son also has LD's and is just overwhelmed. On the bright side, my son is still a wonderful young man, and he is learning a lot of life skills. He just couldn't learn them fast enough. I'm encouraged by the above posters who have a long-range vision. It's so easy to see just the here and now and panic. Best wishes to find a good path for your son.