Statistically, it's extremely unlikely for a long losing streak to be simple bad luck. It is far more likely that you are either: A) using a weak deck, or B) not playing as well as you think you are.
I've seen threads like this go on for pages and pages until we found out the guy only used homebrew decks and thought he should be able to climb ranks as well as an optimized "netdeck." (This is something he should have mentioned from the start because that's an entirely different conversation.)
As for your comment about "I know I'm not playing poorly; it's easy to analyze a game and see misplays." No, it's not. That's what people are trying to tell you here. You don't know what you don't know. It's the hardest Hearthstone lesson to learn, and the most important. If you honestly think your game can't improve, that means you haven't learned the lesson yet, and it's probably why you keep having losing streaks. A good deck can only carry you so high on the ladder. At a certain point, you actually have to start making good decisions.
Yep! That's it! Cannot be explained better. Thanks.
I pick any one of the horrible things that have happened in life, reflect on it for a second, and realize I'm playing a computer game while sitting in a house I own near a refrigerator full of food and drink, and there's a locked door and security system between me and the many many real problems and predators in the world.