@amNotarobot, you are going through a lot and it probably seems overwhelming. It also may feel as if you have to figure your whole life out at once (study habits, social life, grades, college major, career, lifestyle factors…that’s a huge pile of issues all rolled together.)
It’s OK to put on the breaks and focus on what’s right in front of you. You CAN’T know it all…it will happen one step at a time. Try to take some future worries off your plate for now (for example, I’d bet there are SOME positions within the broad medical field that are suitable for introverts…but that’s something you can think about later.)
You are taking some hard classes all together. Also, if you are working so continuously that you have no time at all for friends please don’t judge yourself for being a social failure OR a slacker. It’s just the tough period you are in right now. (Being an introvert, in and of itself, is not a sign of social failure, BTW! It’s just your “normal,” a different style of approaching things.)
So, have you been regularly visiting your professors during office hours? Finding out about tutoring? That would be the first places to start. Your professors really are there to help you. Do you find your professors approachable?
Also, if you’re really overwhelmed, go to the college counseling center. Lots of students do this…adjustment to college is hard for many. Anxiety and depression over your situation can make it difficult to make decisions and can really mess with your confidence. Please get help with this! Working with the counselor can help you clarify what to do in the present and future.
If you stay in your current school, do you have wiggle-room in your schedule next semester to take a course or two that you will enjoy and that will come easier to you? (English, by the way, is NOT impractical. Almost any career is greatly enhanced by a command of the written and spoken language.) There is an ongoing debate as to how much college should be goal-oriented career training vs. open-ended learning-for-its-own sake. In a perfect world, the latter would lead to a great career suited to your own aptitiudes. Its doesn’t always work that way, but exploring subject matter that you like may lead you to a suitable major, and career that you never dreamed of before. For example, an old friend of mine liked both biology and writing. The two seemed incompatible. But she earned a BS in biology and later a masters degree in science writing. She became a successful free-lance science journalist. I’m not suggesting this career to you, per se. Just saying, there are many paths that could lead you to a good life. Also, many students eventually end up in well-paying careers that don’t have an obvious connection with their college major. Please don’t let your current difficulties discourage you.