Just a few thoughts

I've been feeling that way this semester. I had thought that Industrial Design was the ideal major for me, and transferred from another college to my current one because it seemed like the best school for me. But I've suffered from a constant stream of failures since then, and it'll be harder to transfer anywhere else since not many of my credits from my previous college transferred here, so I've lost a lot of my liberal arts credits. The way I see it, though, you can't lose what you've learned even if you have nothing left to show for it. My current plan is to see if another major at this school might fit me better.

I know what you mean about college classes, I am lucky enough to have some breathing room in that I was going to get a Liberal Arts Degree and then switch to my main degree. However I am not sure what I want with my main degree.

As for you, I would suggest sticking with what you like more. Sounds obvious, but I am sure you know the consequences of going with what you are not interested in. Learning languages is cool, and is something I do on my free time, unless you want to have some sort of academic recognition for it or similar, then you may just want to do it on your free time. I personally use software that was only about 25 USD and it works fine, along with other free resources. Also I think there are tests you can take that prove you know the language in an official sense if you don't take it in a school, at least, I think this is true in America.

I get that fairly often, especially having started university, doing a course that isn't what I really want to do. Not that I don't like Law, I think it's really interesting and I am enjoying the course, but what I really wanted to do was Sociology. However, as far as career paths go, Sociology is a dead end, so Law was the only viable option. But I don't really dwell on what could have been, instead I try to focus on what is and what can be.

I don't think it's too late to change where you want to go. Many universities offer foundation courses, and there are also conversion courses. If after three years of doing Literature you decide it's not for you, you can always convert to a Law degree. And be loathed by all the third year law students Although you probably wouldn't be able to go for the Physics or Maths end of the academic spectrum.

As far as learning about other things that you're interested in, why should not getting a degree in it (unless it's a career thing) or not being as good at it as those who sepcialise in it stop you? If you want to pick up a physics book and learn about quantum physics, go for it. What matters is that you're content with yourself on it.

I, for example, spent a lot of time learning sleight of hand and mentalism, reading books on them and practicing them. I'll never be able to apply sleight of hand as well as Ricky Jay, or mentalism as well as Derren Brown, but I'm content with understanding them and having fulfilled my interest in them. Or for a more relevant example, I did an AS in Physics purely because I was fascinated by the subject, despite having no plans on having a career in it or even academically studying it further. And while my classmates who stuck with it for A2 and university are way more knowledgeable in it, I'm still fulfilled with what I learned and could still have a good conversation about it with them.

I think that the knowledge and skills you actually have and pursue because you're interested in them are more important than a piece of paper which merely says that you do. Of course this is all in regards to personal fulfillment. As far as qualifications and careers go, it's unfortunately much more limited. But that shouldn't stop you from pursuing what you are interested in, alongside your career choice.

Sorry for the long and possibly incoherent comment