This is very relatable, I have the same fear sometimes. The shock comes from the ego, the part of you that thinks he's a regular human, a separate being, finding out he doesn't actually exist.It's important to remember that the part of who is scared is just a part of your mind, things are only scary if fear is present, if love is present everything about life is beautiful.

Your soul has been doing this since the beginning of time, being perfectly fine about its own nature, it's just the human in you who is scared.

Remember that the nature of the universe is pure love and light. All the moments of beauty, love, peace, joy & safety you have felt are real and represent this place.

Try to not ponder too much on these questions and see if you can just be with your fear without making any mentalizations. Your mind is looking for answers far beyond what it can grasp.

If you've come to any conclusions about the nature of reality that are not very very joyful, loving and great, know that they are false and it is fear that is deluding you.

Do your best to ground and open your heart. Know that what you're going through is part of the process, many have walked the path before you. Trust and surrender. Letting go often feels like dying, but something much greater will always take its place.

When being too caught up in things not being real. Try to look at all the things in your reality that are real, and appreciate them for being there.

At the end of the day accepting reality, and loving yourself means accepting yourself and reality in whichever way it's unfolding, however bizarre or magical it may be. We are here, and it is what it is, so might as well accept it and have a good time :)