Sorry I took so long to reply. You're right. We can't see light. Light is what makes objects visible. The reason most people don't agree is because they believe the reality they perceive exists outside their heads. That's not true.
When our eyes detect (not see) light, they send electrochemical impulses to our brains visual cortex. Here our brain creates the visual representation we perceive. Our whole lives we perceive this visual representation, not actual reality. Our brain creates images of objects through different visual sensations such as colors and brightness. The light we see is brightness, as opposed to darkness. It's not light (electromagnetic radiation). People confuse the two meanings of light.
Visible light is not visible. It's light which makes objects visible.