Your not a monster!
I don't get stressed when the skids are coming, but DH does when its a kids weekend, his attitude changes and he stresses a little once in a while, not all the time.
And when they are all being particularly annoying we will look at each other and say "is it Monday yet" and kinda giggle.
But we are not monsters.
Even bio-parents need a break from their kids too, doesn't make you a bad person, just makes you real.

Been there, done that, especially when SD lived with us full time. You're not a monster.

I cringe every single day because we have SD12 full time and it sucks. To make it worse, DH has been working 7 days a week for the past 2 weeks so I get to have SD full time on the weekends alone too. And it gets worse--I can't stand BD5 being around SD because she really does pick up on some very nasty habits. I don't think there's anything worse than having a full time SD with no weekend or holiday breaks from her, and then also having to protect BD from a person who lives with us full time.

If that makes you a monster, it makes me one too. In my first marriage I tried to make other plans so I wouldn't be at home. We had them EOWE. My exH hated that I did that because he had no clue what to do with them by himself. I told him to figure it out, he was their parent not me.
Now I live with Thunderfoot full-time. Can never get a break from her because she has no friends to go stay with and her BM has been 100% out of the picture since she was 6 months old. I avoid her at all costs. We never speak. I cringe when she enters the room. I long for the day she moves out.

No, you are not a monster. YOu're a normal person who can't stand being around brats. I suggest stocking up on chocolate and booze and hiding yourself in your bedroom.

You are not a monster. Their father is. And he's letting them become one.

I try to make my SS behave, and I'm told that I'm "cruel". Too bad that he's now failing classes and every other person (except BM and BF!) thinks he's a holy terror.

After being told that I'm "cruel" and "overreacting" and being completely dismissed by my significant other for 3+ years, it's gotten to the point that my only option IS to cringe and hide. You can't fight the kid AND the parent. I've gotten good at taking long baths, faking headaches, and stocking up on books for the weekend. It's AWFUL feeling like a prisoner in your own home!

I would pack up BS15 after school and we'd head out to avoid SS16. We'd often go do our own thing. I just couldn't take it anymore. It happens when you're forced to live with people you don't like. (Here's a tip though, he ran away when we enforced terrible rules like no lying, do your homework and clean the bathroom. Maybe yours will run away too if you're lucky!