Is there a mass balance between the north hemisphere and the South hemisphere.?
Should the mass imbalance affect the tilt our planet ?

Not when you look at it like this

More seriously, the continental plates are relatively thin and ‘light’ compared to the material beneath, so the distribution of the ‘visible’ material is not likely to much affect the overall mass distribution.

The gravity anomaly map of the world gives a better view of mass distribution

Other representations:

Thank you Sr.

Goff this distribution map is shoving that masses of with higher gravity follow the pattern of pacific ring of fire .am I correct ?

Partly, but also following the path of high mountains (South America, Himalayas, Papua). But through Indonesia, the crust is relatively thin and the denser mantle material is much closer to the surface (and coming through in places).