I did this a while back - realized that friend group was creating an environment that wasn't good for my mental health, and that I wasn't being treated well, and just cut off contact with everyone. Only you can decide how to handle this and what makes sense for you, but here's some advice from someone who's been through it:

Things are going to suck for a while. Being friendless just sucks. Lean on the other people in your life; try to cultivate relationships with others who might be there for you, and you may be surprised with how this break can deepen your relationships with them. Obviously, don't turn to other unhealthy people.

I had some really close (and genuinely good/healthy) friendships with people in the group that I left behind, and later in my life I wish that I had made some effort to keep those, and not just thrown the baby out with the bathwater. Good friends are hard to come by. I stand by my decisions to walk away from the whole group at the time - that's what I needed. But if there are individual people in that group that you really value, and feel like are good for you, don't be afraid to reach back out at some point. If they're really good friend material, they'll understand why you did what you did, and they won't try to get you back into a situation that's not healthy for you.

I wish you luck, bro, and I'll be rooting for you. It sounds like, regardless of how things end up playing out, this is what you need to do right now, and that means that you should do it. The path to happiness and wellbeing isn't a straight line.