There are ways to take classes without being in the major, ways to bypass prerequisites but that is not practical for most students. What is in course catalogs et al can be ignored- humans, not computers rule. Of course, it would be foolish to attempt a class for which you have too little background knowledge or skills to succeed. Do you want a bachelor’s degree? Or- do you want to dabble in taking college courses? Technically you could major in everything but that would take many years longer. There simply are not enough hours in a day, days in a week… to do everything we want to.
Okay- so you concoct a major. But- will you study any subject in depth? Or will you merely skim the surface of several interesting topics? Schools award degrees for having met the requirements of an indepth study of a subject, the major. Finding the time to take enough advanced courses in more than two subjects would be very difficult- you also need to meet breadth requirements.
I suspect that two or three years from now, once you have college experience, you will understand more. You will indulge in several courses for the fun of it and choose the most interesting or logistically practical subject for your primary focus/major. btw- there are always courses within any major you will not like but need to take.
Do not discount large universities. These institutions often have many more courses in more diverse fields than many smaller LACs. Look at the courses offered in any proposed majors. You can’t take every course offered due to time constraints but you will not be limited to the standard courses. It can be fun to study something obscure. An example- why be limited to standard languages when you can take one of several Indian languages or literature in translation from other than French/Spanish/German? Or major in Linguistics? You haven’t yet discovered so many areas that you may like.