I hate to break it to you, but to make it through uni and/or be employed in any field with or without a degree, you'll have to talk more than you may want to. Generally to function as an adult in all areas of life you'll have to communicate with people quite a bit. In uni, you'll have to participate in tutorials, mingle with your peers, and possibly do some class presentations if required. Being employed is hard enough already, but surely it's near impossible with terrible social skills. Choose courses based on your interests, and hopefully you'll find it easier to socialise in an environment that suits your passions and involves like-minded people.
Are you socially anxious, or just very introverted, or something else? If your silence is caused by shyness (ie; this can change) and not innate personality, then I strongly advise against choosing your future based on a limiting quality of your present self. Even if you are simply introverted and won't ever change, why deny an interest in a certain subject area just because it may be out of your comfort zone socially? What happens if you come out of your shell in uni, but you've picked a degree you dislike simply because it offers the possibility of a slightly more reclusive career?
