Am I actually "lazy," or am I just burnt out from years of parentification?

The Background My parents’ relationship ended badly when I was 13, and the conflict continues even now that I’m 18. Growing up, I was forced into the "family manager" role. My mom was often out, and my dad was constantly gone—either working or spying on her while she was cheating to get evidence for the divorce. Because they weren't around, I became the therapist, the maid, and the primary caregiver for my younger sister. I cooked the meals, handled the chores, and helped her with homework.

It got so heavy that I became severely depressed. I felt like I couldn't talk to my parents because I was too busy holding the family together. I honestly didn't think I’d live past 16, which is why I waited so long to get my license—I didn't see the point.

The Current Situation I’ve recently started setting boundaries. I realized I can’t be the housemaid forever, especially since I need to prepare for my own life. After graduating high school, I took a 4-month break to focus on my mental health and "heal my broken self."

Now, I’m working 4-hour night shifts at a daycare. It’s mentally exhausting, and I’m trying to save for a car. However, my parents are annoyed. Because I’m not paying rent, they believe I should be cleaning the house full-time. They get mad at me when my sister (now 12) doesn't do her homework or pack her clothes, even though those are parenting responsibilities. When I suggest my sister should help with simple things like the dishwasher, they tell me to "stop pretending" I did a lot at her age—even though I was doing so much back then that I’d literally collapse from stress and lack of sleep. At the same time, they tell me to stop trying to ‘parent’ her, even though she is so babied it’s unreal, and she gets away with everything. They were really hard on me growing up to the point where I stopped showing emotion, but my sister is allowed to throw fits and slam doors.

The Guilt I still do most of the chores, just not everything like I used to. I’ve stopped being their messenger and started focusing on myself. But because of their negative comments, I feel like a "bad daughter." I sleep until noon (since I work nights and my body is physically exhausted), which makes me feel even lazier.

I buy everything I need myself and never ask them for money. I don't yell or argue because I don't feel it’s my place. I just feel like my body and mind are finally demanding the rest I was never allowed to have as a kid.

My Question: Am I being a "lazy teenager," or is it okay that I’m stepping back from these responsibilities? Am I doing the wrong thing by making them figure out how to be parents?