If you spent your entire life in an area with gravity prior to that moment, you would feel like you are falling even though you are NOT.

Our brain is used to gravity. That is why weightlessness feels weird.

But falling and weightlessness are indistinguishable to your brain. They are exactly the same thing.

So, if all the gravity around you suddenly disappeared, your brain would initially tell you that you are falling.

Only after some time would you convince yourself that, "No, I'm not falling... Gravity just disappeared. I'm just weightless."