I don't have any knowledge at all of Film Production so I cannot help with that, but I can give some general advice. The thing is, you can only really define something as useless if you know what your goals are and know that that thing isn't going to in any way move you closer to that goal. It very much appears that you do not have much of an idea as to what you might want to do in terms of a career, and that is absolutely fine. But it also means that, by definition, it's not really possible for you to do something at university that is useless. Regardless of what you do, in the three or more years that you're at university, you will gain a significant amount of knowledge in a particular subject. You will also meet people, gain new experiences, and develop a range of new skills. Those will all contribute to the type of person that you become and what you will eventually end up doing. The degree itself may be pivotal in that, or it may not. But it doesn't matter. Whether you use your degree or not, all of these experiences move you closer to what you will eventually end up doing. Even if you do Film Production and decide at the end of it that you want to do anything but film production, there is value in knowing what you don't want to do, because it can set you on a path to what you actually do want to do.
None of this means that you should be completely blasé about what you study at university. I'm not advocating for that at all. If you don't have a clear profession or career in mind at this stage, and many people don't, just pursue your interests and keep an open mind. That will at least keep you involved in things that you are interested in and put you in a good position to make future decisions, whether that's to stay on the same path or pivot. Either way, don't put pressure on yourself. You have so much time to find what it is you want to do, and all of the experiences you gather along the way will contribute to that. Just go with it and enjoy the next thing, whatever that is. At this point, the long term vision can certainly wait.