Take a year off.
You're terribly burned out.
And, beyond that, there may be a nagging voice, deep down inside of you, that tells you that these are your parents' expectations, their hopes and dreams -- but not your own.
What should you do with a year off?
Doesn't have to be related to your course of study. Just get into the habit of getting up, getting out, and doing work. This can be clerical, fast food, become a dog walker. It. Does. Not. Matter.
Why am I suggesting this? Because you could use some independence. And some perspective. This does not necessarily mean going back to pre-Med is the answer. But you may find that you miss school.
Also, learn how to study.
Here's a book - https://www.amazon.com/Make-Stick-Peter-C-Brown-ebook/dp/B00JQ3FN7M/ref=sr_1_6?dchild=1&keywords=how+to+study&qid=1626468066&s=books&sr=1-6#customerReviews
I can't vouch for it, but it seems well-rated. Go to your school's guidance counseling office and ask if it's okay or if they've got better alternatives. And tell them what you told us. A tutor may be in order, even if you're not at school. This would be someone to work with you, and essentially teach you how to learn.
I suspect that some of your ennui and lack of success may be due to having been gifted/still gifted so some things come easily. And then when other things don't come quite so easily, you flounder. You need to learn how to learn the hard stuff, the stuff where you can't just wing it.
Third task for a year off: think about your life.
Where do you see yourself, not just in 5 years or 10 years, but in 40? Yes, you can have a 40 or even 50 year long career. Barely skating by and not being motivated is bad now. Imagine it in 4 or 5 decades.
Talk to a career counselor. Take some self-assessment tests. You may find that the best path for you is something else entirely. In fact, I think that's exactly
what you're going to find.
Fourth and last task for a year off: learn how to be assertive.
It's a useful life skill and everyone should be able to diplomatically get what they want and need.
And then use your brand-new assertiveness skills on your parents, to explain to them that it's your life and not theirs, and you're miserable. You're self-sabotaging to get out of a path that you just plain don't want to be on.
PS IANAD, and I am not a psychologist/therapist/psychologist. I'm just someone who had 2 lousy majors where I felt the weight of expectations upon me. I became a far happier person when I studied what I wanted to study, and developed and pursued a career that could work for me.