I can assure you, you won’t stand out at all. There are actually more grad students at Yale than undergrads, so more of the student population is 22+ (many of the PhD, law, and med students are closer to 30 or above).

I’m a grad student now, but I started at community college and I remember feeling a similar way when I was around 4-year college students. I tried to remind myself that going to CC didn’t mean I was any less intelligent or capable than anyone else, and in the end I transferred to a good undergrad and got the same degree as everyone else— I saved a lot of money in the process, too!

I freely tell people at Yale that I started at community college and I always say to this day it was the best educational experience I’ve had. No one has ever judged me for it. Try not to get in your head about it, you belong in those study spots as much as anyone else! You can even use Sterling or Bass library to study when they’re open to the public during the day, no one will ever bat an eye. Best of luck in your studies.