I think many kids have some level of anxiety when it comes to college.
With mine, they weren’t interested in “official” tours of colleges. Too much pressure. So what we did was, starting pretty early, we used to just visit colleges “unofficially” and go to have lunch or dinner, visit the bookstore, walk around campus, grab a coffee or ice cream, strike up conversations with friendly students, etc. Sometimes we had a reason to be there, and sometimes we didn’t, but it took the mystery out of the college atmosphere and they began to enjoy seeing the different types of schools that were available to them. It helped them narrow down where they could (and couldn’t) see themselves, and what kind of experiences they wanted.
I agree with the pp who mentioned getting involved with groups. Both of mine were fortunate to get involved from the beginning with groups that they quickly became a part of - DD with her major (Nursing) and DD with his sport (same as your son’s). It’s not to say that wasn’t anxiety provoking - it was! BUT they were able to work it through because they realized they weren’t alone in their fears as freshmen, plenty of others were in the same boat. As a matter of fact, the day before classes started, DD’s cohort had a party. She panicked a bit and at the last minute didn’t want to go. But I assured her everyone was feeling the same way and told her to go and act friendly, make eye contact, keep an open posture, etc. (Just like we did on visits.) So she did, and what happened was that several people came up to her and asked if they could sit with her because she projected warmth and openness. And the people she met that day became her core group of friends all four years!
DS had a natural group with his team, but that’s not to say he wasn’t also pretty intimidated at first. But he showed up day after day, got to know people, and started to earn respect as a player and person. Coach was good and also had team building activities for freshman and transfers that turned out to be a lot of fun, and DS began to relax somewhat after those. With playing, he was just himself, as he’d been for so long, that part came very naturally. So fairly quickly he integrated into the team and it was great to watch. Traveling to FL for their first tournament they split up the condos with a mixture of upper and lower classmen. As a freshman he and another frosh got the pull out couch for the week,

had to do laundry, shop, cook, get along, hang out together, go on long rides in vans, eat out with team, fly with team, be ready for curfew from captains and coaches, and be responsible for something (like a bucket of balls), etc. - not to mention, perform. But by that point, he was good even though he was still a little, what’s the word - cautious, maybe, lol. I read a lot of the notes he was sent from his teammates as a senior (during Covid) and there were so many, “You were the first to welcome me to the team” sentiments, I actually teared up reading them. Has your son thought about playing in college? It’s not too late. Maybe
that would interest him. PM me if you want some ideas. And good luck. Parenting isn’t for the faint of heart, is it?