My dear, I really much get you… My parents are just like that… The only way is to stay focused and try managing things the best you can. Are you keeping a notebook for the plans for every day? That is what helped me a lot. Just a list of everything that has to be done with due dates, and for every single day write those things you haven’t finished or have new. And cross out what is done. Even the smallest. This will give you a personal reward of that you are doing something. And you will be able to show you parents to say “look, I am a mature person with my own goals and here is what I accomplish each day”.
You are a human, well and they are humans too. They are somewhat overwhelmed and we have no chance except for accepting it. Just show them your plans at some point and what your are doing each day.