"我发誓，我还是不明白为什么民主对每个人都有效，唯独对我无效。"

Simplified Meaning:

This quote is expressing frustration about feeling excluded or ignored in a democratic system. Democracy is supposed to mean everyone has a voice and equal rights. However, the person speaking feels left out or marginalized, as if their opinions and needs don't matter. Imagine a classroom where the teacher says that all students can share their ideas on what the class should do for a project. However, one student never gets called on to speak, or their ideas are always ignored. Even though the teacher claims everyone gets a say, that student feels invisible. In the real world, this happens when some groups of people find it hard to make their voices heard in politics or society. They might feel that their vote doesn't count or that their problems are not addressed. To apply this idea, you can work to make sure all people in your community are heard and treated fairly, advocating for those who feel overlooked. This ensures democracy works for everyone, not just a few.