I feel just like that about any fabric I buy off the roll. It has to be the right day before I take a deep breath and cut into it. Give me a remnant however and my confidence blooms - all those inhibitions seem to disappear.
Having said that though, I have 3 lengths of fabric that I bought in an Oxfam shop for a couple of pounds, at least 10 years ago - if not more. It is hand woven fabric, on a narrow loom, that someone has obviously taken great pains to produce. I have never cut into it because if I mess it up all their hard work will have gone to waste. Maybe I am wasting it anyway by not using it?