I have a stressful relationship with my parents
What part of your relationship with them is stressful?
They treat me harshly. They need to ease up on me.
If you find the relationship stressful you should tell them. If you are having more problems you should seek professional help to deal with the stress.
I'm trying to work on my relationship with them.
I'm really glad you're working on it. I hope they see things from your point of view.