Hi, sorry in advance but this is gonna be a bit long.
I'm a grade 12 student who's taking my IB finals this week and will be graduating this June.
Trust me when I say I understand the situation you're in. I am one of 12 students who picked IB in my year group, and even during the final stretch I most probably would not recommend it to anyone I know. Don't get me wrong, it's true that it prepares you for college and you can learn to work faster, but people don't talk about the price you pay as a student. Most of my peers have lost any/all interest in the course they've applied to uni for, there are also many all-nighters that leave you drained, and most people begin to give up on their mental and physical health to complete the two years.
Also, you often spend every second doubting yourself and being compared with others, which (I shouldn't even have to point out) is very harmful for us as children. Even though I am completing the diploma, I often think that I missed out on my time just being a carefree teenager because I was too busy with an IA or my EE. I also had to give up many of my hobbies during this time so my passion fizzled out pretty fast.
Additionally, receiving a certificate is not a failure at all. In fact, the year that graduated before mine had a student who faced some mental health issues and consequently didn't fulfil his CAS requirement. He is still in a brilliant university in Seoul, and doing much better with his health too. Don't let others' expectations make you feel like there is only one path in life, do what is best for your well-being and let others feel however they want, that's none of your business.
The one piece of advice I would like to leave you with is that you should spend some time by yourself figuring out what future you want. Volunteer, work part-time, and research as much as you can. Participating this way will help you connect with your values better and understand what qualities you're aiming for in a career. I have a friend who dropped. out in high school and got credits through online courses, and is in an amazing uni in London now. Nothing is impossible if you're determined to achieve it, but don't let academic validation be what stops you from being happy and healthy.
As for family, those that you care about, try to sit down with them and calmly explain that while you may not have everything figured out right now, you are certain that homeschooling/a gap year will be better for your mental health and will give you time to study while also getting experience and building a pretty impressive CV. Tell them that there are several ways for you to find a fulfilling career without the IBDP, and that you're prioritizing your health. For those who try to criticize you, remind yourself it's not your responsibility to make them happy, it's only to make yourself happy.
I know this isn't easy, so regardless of what you choose, I wish you the best of luck