Should I really be stressing over my ATAR?

I haven't even started year 11 yet and my parents are already pressuring me to start studying year 12 and HSC stuff so that I can have a good ATAR, and they tell me that if I don't i'll end up homeless and in debt?? I know they're probably just exaggerating but the way they're stressing about it feels like it's the end of the world or something, should I be just as stressed as them??