Sunk into the lava ocean on Minecraft?

Keep going up. You should have died but it seems to me you have some sort of fire resistance potion. I think you can swim in lava. Keep going up and see what happens. But do so quickly, for your fire resistance won't last much longer if you keep walking or looking in your inventory.

If you are in creative just do /kill you won't lose your stuff. Survival… How are you not dead