I need some opinions on this situation.

People usually describe me as a deep sophisticated person. I do have an interest in complex matters and can talk about issues in depth. My peers respect that about me.

The problem is I freak out in simple situations. For example,today I had to fill in a form which required copying some info from a given sheet. One information was too small and I looked confused to find it that the receptionist said she will fill that column. I could see that she was amused that I did not find it and I was there to do a big presentation.
I felt so much shame. This happens to me all the time. I sometimes look confused over simple things and look stupid and this ruins my stand especially with people I am meeting for the first time or someone who doesn't know me very well. In a coffee shop ,I'll look confused if I don't find the sugar or a straw.

How do I solve this because it is causing a lot of stress in life. What could be wrong??