I can't interpret very well like other normal people. how do i overcome this? can therapy help?

Interpreting skill: I am not sure I understood your problem. It seems to be related to lack or inadequate interpreting proficiency. Interpreting skill is an acquired one not an inborn one and therefore not everyone can master interpreting as well as others. It takes time and practice. If you have speech impediment, that's a different issue where speech therapy may help.