I’ve also suffered so much emotional abuse I just don’t have the patience anymore, I get overwhelmed quickly
This is like saying 'I just ran a marathon, and now I don't have the capacity to run anymore, and I get upset if someone tries to make me'
You're not feeling close to the edge because you don't 'have resilience'; emotional abuse has used up your deep, deep resources of resilience. That's very different. You're exhausted, but that doesn't make you 'less' than other people. Whether they have it together or not isn't the issue. It's whether they would have it together if they'd been through what you've been through. And unless you think that everybody has a history with lots of emotional abuse in it, then you'll have to accept that quite possibly, your feeling of overwhelm is absolutely normal, standard, average, and actually, healthy, behaviour/emotion, given your circumstances.
You can speak to yourself and make yourself feel better. You are currently abusing yourself, using your abuse as a weapon to hit yourself with
I try because people think I should be better but I’m not due to what I went through
You are telling yourself that you are somehow less than people expect you to be, because you were abused, but you could be telling yourself that abuse was like a form of emotional 'gym', where you struggled and suffered, but you came out stronger, and now you're in a position to say 'NO! I've had enough of this!' which is a strong stance.
Why do you visit your in laws instead of staying home? Do the kids visit them too? Could your partner take them, and give you some time to stare cross-eyed at the wall and think nothing for a bit?