The overweight people for example, continue eating lots and they don't seem to get pains.

ALso other skiny people, like for example the ones that do competitive eating.

ON the other hand I just overeat a little and I get Gallstone symptoms.

Does it have to do with the type of CELL Strength people have?

It can be the type of foods eaten, but also just the health of the organs. Some people get them, and many don't, I am sorry you get them, but you seem bitter about it,
What is the problem?

Plenty of fat people get gallstones. People of all shapes and sizes get them.
I had my gallbladder out when I was about 57, and was in and out of the hospital in less than a day. I took a painkiller that night and the next morning, and that was it. I wasn't even in pain.
It's no big deal as long as you are generally healthy.

Yes, plenty of people get gallstones. My mother had her gallbladder removed when she was 60. I have had patients (I'm a Registered Nurse) who have had theirs removed as early as 19 or 20 years old.

They come from all walks of life... rich or poor... skinny or fat... healthy diets or fast food diets.

It's no different then why some people have to have their appendix removed and others don't.

You could possibly be getting too much calcium and lacking magnesium. Drink plenty of healthy fluids too.