When I was a piano student, age 8 to 16, I didn't have much emotion. I felt pleasure at melodies, annoyance at a couple of dissonant pieces my teacher made me play, that was about it. I had a protected life with not too much trauma, and piano was something that I didn't approach with fear or anything.
When learning, there is a period just after the hands separately slowly part, where I read the score very slowly and follow it. Some time later, I would get better and go a little faster, without looking to see more than what segment came next. Then as I start to memorize the piece, there comes a time when I made mistakes because I am not looking and miss some things on the score. When this happens, I put markings in the music to remind me of where the mistakes are, or my teacher did. Then as I played I could tell bad spots are coming up, and look ahead at the markings of what my mistakes often were, leaving the the current music to run on memorization. Cerebellum memory I call it, the muscles don't remember anything. As far as panic or nervousness goes, I put that to playing faster than one is comfortable with. My teacher didn't make me do that, and unlike a conservatory, I wasn't expected to learn a certain number of pieces a month. I was on a 6 to 10 recital pieces every six months cycle, which gave me plenty of time to learn pieces without panic. The E. M. Berman exercises I did every two weeks or less about as emotional as reps on a weight machine.
When I bought the piano age 32 and started learning on my own, there was much more emotion to be expressed. Love, tragedy of the wife's illness, divorce, being forced from the best job I ever had back into the Army, lots of excitement of military training, a new job in a new city that required people skills that didn't come easily for me. Being invisible to women of appropriate intelligence or education, health, and religion. Adults have experience, or have never lived enough because they weren't trying anything new.
I took up the 3rd movement of Moonlight sonata first; there is a lot of anger that can be expressed there. Think of Beethoven's love life, Fur Elise was written for one of his interests, and she was too good for him to have any sort of relationship. All that talent, and no heirs resulted.
Later I took up PIctures at an Exhibition that inspires me to think of a running movie in my head (and not the picture Moussorgski tells us to think of). I still go mindlessly through totally abstract music; a sense of wonder at the winter landscape is the emotion with my on my current effort, George Winston's Holly & the Ivy. I've seen a Kansas ice storm and found the visuals quite wonderful. We are having a mini-ice storm today in Kentuckiana, quite beautiful and so appropiate for this tinkly piece.
So perhaps when you the original poster have lived some more, you will have some experience to be emotional about with your music. Until then just follow the expression markings, pretend they reflect emotion. It is good training. Enjoy life, or withstand life, whatever, with music to back to up through the bad times.