What you’re referring to is called genocide. I don’t think I’ve ever heard of anyone promote euthanasia as a solution to depression, or any disability, outside fascism — and fuck those assholes. Their opinions are psychopathic and irrelevant.
This isn’t about you. Euthanasia is about personal freedom and choice. It’s about enabling the people who have terminal illnesses, and are guaranteed a slow and painful death, the ability to choose a painless death on their own terms. Watching my father die of dementia is what I imagine hell would be like. Forced to live in a prison of your own mind, unable to remember anyone or anything, or what happened a minute ago, for x number of years until you forget how to swallow, then die of pneumonia. That’s not something I’m willing to live through, and I’d prefer to choose to die a few years earlier to avoid it. The opposition to euthanasia directly causes millions of people to suffer needlessly. It removes their freedom and choice.