If you only believe what you see, and know what you have witnessed, then know this.

I have been abducted by aliens and they were fully physical.
Time travel is real.
Technology today is in the stone age compared to the rest of the universe.
What is more realistic? That technology is so advanced that aliens can see you but you cannot see them? Or that we live alone in space and aliens arent real?

Bear in mind I met aliens that were fully physical.