Why does the present moment feel so short, even though it’s technically all we ever experience?

I keep thinking about this and can’t quite wrap my head around it. The present moment is supposed to be all we ever actually live in—everything else is either memory or anticipation—but it somehow feels like it’s constantly slipping away.

Like, the second I notice “this is happening right now,” it already feels like it’s in the past. It’s almost like the present doesn’t have any duration at all.

Is this just how our brains process time, or is there something deeper going on with how we experience reality?