Hello.. I`m sorry if my english is bad.

My piano teacher said that my technique is quite good. But,I can`t express my feeling when I play piano. ABRSM Examiner also said like that.
How can I express my feeling?

Treat the melody of a piece like a song that you "sing" through your fingers. When you sing a song it is easy to put expression into it. If you sing a melody on the piano you should hear natural places where you might change dynamic, tempo or pauses. Also pay lots of attention to the phrase and slur lines- the composer put them there for a reason.

Expression in music is not a science, it just requires you getting involved with the music rather than just playing the notes.