It's inadvisable to embrace a low feeling, to wallow. I don't know how to say I'm sad without thinking I sound childish. I've heard interior darkness described as precious, goth, morbid, intense. It's not polite conversation. It's a punchline or parody, an archetype, an act, a cry for help. It's en vogue to admit a feeling or claim acceptance of it—in oneself or others; it's hard to genuinely accept it.