As a child, I and one of my sibs both had great difficulty with opinions, deciding on mundane items (clothes, food), etc. In retrospect, I think my sib had difficulty because they tend to be phrased as absolutes, and because it's impossible to know every possible condition or piece of potentially relevant data, the question could not be answered ("insufficient data").
I eventually learned to manage my "IDK"s when I finally began to realize that there is no real bad outcome regardless of how I answer, "what would you like to order for dinner?". Very little is riding on my answer. It is highly likely that I will enjoy whichever dish I order, and nothing seriously bad will happen if I don't. There might be another dish I would like better, but that doesn't take away from my pleasure in the dish I have. And if I don't decide on either one, I'll have nothing, which is highly likely to be a less desirable outcome.
In some cases, I think this is a form of perfectionism.
