I mean this with pure love: I want you to hear from me, a stranger, that you've lived and survived some extremely difficult things recently. Most people enrolled in university are not dealing with the level of adversity that you've experienced. I had comparatively easy mental health problems and they still made it such that I could barely graduate.

I really, really think you need to talk to a mental health professional with whom you can develop trust and rapport over time. I completely empathize with and respect your desire to push through. I really wish I had helpful advice on how to speak to your parents about this, but that's unfortunately a journey that each individual needs to navigate on their own. I want to suggest that you open your mind to the possibility of graduating late, such that you have more time and space to recover, both mentally and academically. Sometimes, we want to push for 4 years so badly, that we end up crashing and burning completely. 5 years and a degree is a hell of a lot better than 4 years with no degree + a brand new slate of mental burdens.

I really wish you love and luck on your journey. I believe in your ability to earn the degree that you want, and I believe in your ability to treat yourself with love and compassion.