Your body dies, but your spirit and soul will live forever. The only question is whether it will be an eternity of fear and suffering, or an eternity of joy and happiness.
If the real world is an illusion to you, then you are an illusion to the real world. You are nothing to the real world, you are not in it and it knows nothing about you.
Only information can go through enormous cosmic distances. Bodies won’t survive an interstellar trip, but souls can move at the speed of light and faster. Soul-astronaut is highly intangible and seems either a ghost or a kind of spirit to onlookers.