Maybe it was a plane, because the plane was flying towards you, so you looked like he just didn't move. Sometimes half a minute, sometimes 3-4 minutes. I wonder how much time you have before you can see that still bright spot. Because I saw it, too I watched it for a few minutes before I was sure it was an airplane. After flying high, I turned my head and could see it moving.
If you can't move, basically exclude artificial celestial bodies such as satellites and iridium satellites.
Why are you sure it's not a star?