I cut my finger very lightly on a freshly opened can of dog food will I die or get a disease please answer?

Finger cut. If you washed the wound very well with soap and water then it is highly unlikely you will get a disease and die. The main prevention of disease with cuts is to thoughly wash and clean the wound.
Not. Dog food (and other canned food) is sterile inside and the cans if stored properly in a clean, dry place, will carry no organisms. A superficial cut like you describe should be cleaned and covered with a normal band-aid and you should be fine.