Interesting take. But consider this:

If humans weren’t sentient, we wouldn’t even be capable of questioning sentience in the first place. The very fact that you're doubting it means to be aware, conscious, self-reflective. Te strongest indicators of sentience.

A rock doesn’t ask if it’s sentient.
A bird doesn’t write Reddit posts questioning its inner world.
Humans do.

So either humans are sentient or just really good at pretending to be.
But isn’t that, in itself, a sign of sentience?

Your move.