My husband, who speaks French fluently, observed me agonizing over this en, dans, à, feminine / masculine countries, states, regions and cities and he laughed. He asked why I’m wasting my time memorizing trivia that won’t make a difference when it comes to having a conversation with a French person. He says nobody except a French teacher would give a rat’s ass if I made this mistake. It doesn’t prevent understanding or communicating.
The fact that I can’t advance to other lessons that will further my ability to communicate, until I get this glitchy thing memorized, is very frustrating. It makes me afraid to even try to speak, for fear of making this kind of mistake.