How can I change the skeletal mesh position in a c++ class? because I got this. 

I´m working in UE4 -> 4.20

I know that the pivot of the mesh is on the bottom, but there must be a way to change the position by code.

By the way, my object is a character's derived class.

All you have to do is change the relative position of the character to the collider.  That fixes it instantly.