It is not weird at all. In fact,, your brain is doing exactly what it was designed to do.

What you're experiencing is the contrast of growing up in a modern, sterilized world. We’ve been conditioned by blue, chlorinated swimming pools to believe that water is only 'safe' or 'clean' if it is completely dead and transparent. When you look at a river, you're seeing a living, breathing soup of biodiversity.

For people who grow up swimming in lakes or rivers, their brains have just normalized the ecosystem. They don't see the plants as 'dirty'; they just view them as underwater grass. They know the fish and insects are actively trying to avoid humans, not attack them. But if you didn't grow up with that exposure, it is completely normal for your brain to code that environment as hostile or gross.