Anyone ever feel afraid or discomfort to take free stuff?

Since I was a child, I never steal stuff from others. I always had dignity, even though I was poor.

In college, I went to the advising office and they had a cup full of pens. I took one to fill out my form, and as the counselor called me, I put in back in the cup. The pens were actually free and for us to take, but I felt guilty to take it. Another time, another office, there was a cup of pens and snacks for students to take. I had the urge to grab a pen and a snack when I sat alone as the advisor went to get my papers. Somehow, I was afraid to grab one. I regret not taking the pens when they are free.