I'm in a similar situation except I love horses but I'm also really academic. I love science, maths and I would love to go to uni to study something like that. However, I would love to show jump and work with horses whilst being academic. Getting a job with horses is difficult and it's hard to actually get paid. Most people working in the horse industry are either poor or rich and most have to be self-employed (which scares me!!). I don't have the money to ride horses or train them really professionally for a living. But I would be broke attempting to do that. I also hate the risk of possibly not getting employed- I would hate myself. And if I couldn't handle being self-employed or it didn't work out I would be so annoyed! As well as this- I love academia. It feels like it's one or the other. full force into horses or full force into something academic because I'm not sure if I could balance them both. I'm super conflicted, they could both work out but either route I would feel a piece of me missing.
I haven't got it figured out, but here's my advice anyway:
Just follow your heart honestly. If you're happy in the end it doesn't matter. Are you academic and passionate about psychology? If you are, do you see yourself having doing the role/ chores involved in the environment and working hours? I would first look into whether you would enjoy the degree itself though, are you cut out to be an academic uni student? It's a lot of debt, a lot of time and a lot of hard work. However, if you enjoy the subject and are motivated you would have a great time. Then I would look into the actual career paths at the end of it. You might change your mind but still see yourself getting a job in psychology. What's employability like, working hours and would you enjoy what you would be doing?
It's the same for acting, look into the career paths, the logistics of it and ask yourself if you'd be up for all of it.
For another option, you could always study psychology somewhere where there's an acting society or uni team. For example at Cambridge there's a dance team- they might do this for acting at other unis.
What you could do is act on the side of studying for psychology. I would say one of the routes could be a plan B but either way, you probably need a lot of hard work put into the one subject.
It sounds stupid to ask you 'what are you most passionate about' so I won't. Because ultimately it also comes down to which path is more logical for you. If you study Acting but have no chance of making a living at the end of it, you'll probably be upset and regret your decision. Same with psychology, you might always feel like a part of you is missing.
You could always write out the pros and cons of each route, learn more about where they could lead you and maybe even go to some acting/psychology universities. You might decide that you hate the idea of the course...
Don't be put off by people saying 'oh that route's too hard', both routes are hard it's just a matter of which one suits you the best.
Good luck, I hope it all works out for you!!!