Help me understand Romans 14:23 from the opposing perspective

Help me understand Romans 14:23. As we know as Christians, we tend to disagree on interpretations which leads to sometimes uncertainty. For example, say there’s something you you’ve always done that you’ve never believed was wrong/sinful. Let’s say… using tampons for example. And then someone tells you it’s wrong and uses a vague scripture to back it up. So you start to question it and wonder if it’s actually sinful to use or not. To me this sounds like doubt but I feel like it’s unfair to say I’m in sin since I’m not 100% sure it’s a sin, I’m just trying to do my due diligence… What are y’all’s thoughts?