I know, it's very hard. After all, we're not so different from animals. As Akutagawa said in his "Letter to a Certain Friend," we are human animals, and therefore we have that monstrous desire to survive. Our system struggles to do so: vomiting, white blood cells, electrical pain signals, everything that tells us that "something is wrong" is the powerful wall that seeks to protect life when it will inevitably succumb one day.
Our mind may wish to die. I wish to die, I wish to no longer be in this world, I wish to cease being human... I wish to be nothingness itself, and nothing more. But the animal force that has been part of human beings for years of evolution and has become complex since we acquired consciousness makes this more difficult, so it's not that you're useless; in fact, it's the opposite, in terms of the life force that prevents you from simply doing it.