Google "Sunny 16" and spend about 1/2 hour perusing what you find. Read with 3 facts in mind: 1)you have an f8 aperture, 2) you have 1/100 shutter speed, 3) you use either iso 100 or 400. It will soon become very obvious why your pictures were so bad and what you might do to get decent results with it.
It really is very limited in the circumstances in which it will produce good results. There are reasons most people of a different generation than yours call those cameras pieces of junk.