I can understand what you are saying, pianoviolin.
There are times when I practice, I just play the notes with no emotion. Sometimes I practice for technique, making sure I am learning the notes and fingering. Then the next step is the comfort level, when I can play without worrying about the technical aspect of the score. At this level, I think of the phrasing...which I become more sensitive to the sounds that I produce when I strike the keys.
I think after learning a piece for a while, it becomes a part of me, a part of what I am becoming as a person and as a pianist. It's the experience that I embrace while playing a piece with emotion. The emotion will come after learning the technical aspects of the music. I have days I may not feel as good and so I just play the notes. I know I cannot play with emotion on every piece I'm learning nor can I play with emotion each day. Also, the worrying may ease up as you become more comfortable in learning a piece because it will grow within you.
I've been learning Debussy's First Arabesque for a long time. The poly-rhythms are a beast to learn! THAT was technical! So I had to concentrate on that along with the fingering throughout the whole piece. However, in time, I grew more comfortable in playing as the piece grew inside my mind and heart. Now, I can play this piece with ease, pleasure and with emotion.
Embrace what you have learned on the piano, pianoviolin, because music should not ever have to make you worry so much.