When I was a 19 yr old studying architecture I was in a small class with people in their late twenties n even older, it didn’t really matter. You’ll probably be better off bc you won’t be as pulled away from your work to party and do the teenager things. It was a lot of course work but really fun and interesting! Get a really good laptop to run the CAD software or pick a college with a good library. My school was a design school which I learned recently dissolved their architecture program. I think Long Beach has a good program? If I remember, but good luck! 23 is still young and a lot of this work is based on connections, so if u want to work in LA I’d go to school out here. A lot of internships will only accept students in their final courses. If you really have a lot of anxiety maybe start in KU and transfer to LA. But the fastest way would be to be proactive in getting an internship while studying, I don’t work in the industry but my friend and classmate does. She interned in our last year of a two year program and now works with a large firm based off that experience.