You can survive being shot in the stomach as long as the bullet does not go any further and damage other organs or your spine or nerves.
Being shot in the stomach is less serious than being shot in the heart, the head etc.
But even if you get shot in the stomach you need medical attention right away to be able to hopefully survive and the longer you wait for medical treatment the less chance you have at surviving.
There have been people who have died when being shot in the stomach because they did not get medical treatment right away.
But there have been several people who have survived getting shot in the stomach but medical treatment is needed.
Also there have been people who have luckily survived being shot in the head and heart as well but they were really lucky and had medical treatment which saved their lives.