LIBRA GIRL NURSE
your parents worry cause they care - if they didn't care they'd not be interested in how you are, what you're doing, where your life is heading etc. All teenagers feel like this, their attention at times will drive you mad, but you have to constantly remind yourself of why they're doing it.
Being stressed also is a part of the teenage years, it's a time of change, and that in itself can be stressful. It's a good idea to make a plan - remembering that that plan might need to be changed or tweeked as the year goes past. Use a diary to manage your time, so that you can get a balance for school, homework and other activities like sport or just catching up with friends. At year 7 you're in the lower part of the school, the year 12's are at the top, and it's normal, though not necessarily nice, that they throw their weight around a bit - this will part so the best reaction is to ignore it all - and of course to try and remember what you're feeling now when you're in year 12 so that you don't repeat their actions.
Having a plan will also allow you to set aside sleep time, and being well rested, when paired with a good diet and physical activity, will help in how your moods are etc. And if you know that you are having times of being stroppy - could this be another reason why your parents react as they do?