So I'm gonna give some advice that's maybe not typical for this subreddit.

Do you know you're going to be an actor forever? Do you dream of being a waiter for the rest of your life just for the chance to be on stage? I know a lot of people who do. If you're not one of those people: you're lucky. Go to university.

You can still audition for every play. You can still take most if not all of the classes you want to in theatre with a double major, joint major, or minor. Hell, you can even still get a Master's in acting afterwards (none of the senior in my college that got into an MFA program were theatre majors or minors) [but dear god, don't go for your Master's unless maybe it's a full-ride scholarship. It's just a terrible decision otherwise and even then it might not be great.]

If you go for ever show and take every acting class anyway (find a school where getting into the acting classes isn't competitive; it won't be hard just make sure) there's not much you'll miss out on. Yes, a drama school may help you become a better actor. More specifically, if you somehow already know what method works for you, picking a drama school based on the acting style that's right for you (Meisner, Strasberg, Chekov etc.) will help you because it'll focus on what works for you and then refine it. But...it won't a) suddenly make you a great actor, b) open a world of doors that will allow you to make acting your full-time job, and c) it doesn't work for everyone; some people don't need a specific method.

Here's the simple truth: no one in an audition is going to judge you for not having a BA in acting. But the rest of the job world will judge you for not having one relevant to their field (and no amount of sweet talking about how acting taught you inter-personal skills, memorization, the value of teamwork and pride in one's accomplishment will put you over the guy with a more relevant degree.) The world where just having a college degree can open more doors in over.

The day I graduated I realized I had made a mistake choosing my major. I'm back applying for the two minimum wage jobs I could get before I went to college and trying to learn web programming on the side. I probably should have at the very least joint majored. Now, admittedly, I was never as in crazy love with acting as my co-major (and I never really cared for theatre as a whole as much as acting specifically as well) but like I said, regardless of our passion, we're both currently working part-time in a grocery store. In fact, only our theatre minor got a summer teaching job in acting (so one more point for "you don't need the specific degree.")

I will say: I made a lot of good friends and pretty much the only reason I had a relationship in college was because of all the girls I met through acting. But, if that happens to be something your thinking about: those "social doors" are opened by taking the classes and being in the shows anyways.

Am I just recommending "giving up the dream" for financial security though? I don't know; maybe a little but I don't think so. With a minor, ever actor door is still open, but a good number more fiscally rewarding doors are open too. I enjoy acting. But I'd also enjoy not living with my parents indefinitely, having a real source of income (though admittedly that's how to get nowadays anyways), and maybe down the line finding opportunities to audition for my local playhouse. Or you: realise acting is your passion after college, and your really not that much more behind anyone else really, because the truth is finding an acting job, and consistent acting jobs, whether you majored, minored, or went to drama school as are all fairly equal: unlikely.

As for your specific situation, I don't know what jobs a Geography/joint-geo degree would open. Your backup plan, if that's what that is, should obviously be an actual backup plan; they can't both not open doors. I would try to do some research on that.