I'm not happy. I don't think I can experience happiness.

Things give me joy. A brief satisfaction, a quieting of whatever urge I have. It's silent. There's nothing driving me. But then, that ends. People, clothes, food, work, I need something new, something to excite me. But the feelings don't ever last long. Do I just need a distraction, so I'm not alone with myself? Am I really incapable of just being happy? I feel like, yes, I am incapable. Even just trying to think of something that might make me happy is exhausting.