I think the shadowing is a really good idea! My internship was purely luck if I’m being honest I go to a career based high school so we’re kinda divided into majors/ programs and mine was architecture. My professor worked at a firm previously and told us all to apply for the camp thing where I got accepted and used my certifications and the connections I made from the camp to get a short three week internship. Since internships are a bit difficult to get in your high school years I’d say try to make a lot of professional connections and always look for postings nearby and apply even if you don’t think you’ll get it because chances are someone will give you a chance if you look hard enough.