"In the Hellman's mayo it says 0 carb but in the ingredients, there is sugar listed!? So im a bit concerned about using mayo Should i keep using mayo?"

If there are less than 1 carb, they are allowed to list 0. I would guess that is what is happening with your Hellman's. I would use it and not worry. It sure makes things tastier (egg salad, chicken salad, lots of things.)