Is there a reason you need to discuss this with your parents?

I like the advice others gave you. You need to decide what you want from your parents when you tell them about your depression. Do you want support? Do you want understanding? Or do you just want to let them know that this is what you have and they can accept it or not, just so they know that this is what you know you are dealing with?

It might be worth asking the more sympathetic parent to go with you to your therapist to discuss your illness and to possibly educate that parent.

Maybe you could talk with your therapist to plan how to talk to your parents about your illness, and how to handle the various possible outcomes and how you can deal with those situations.

it's tough to be in that situation. I was there myself a long time ago. My solution was to leave and develop my own support system. I hope you don't have to do that if you don't have to.

Good luck, Blue.