When did you last stop?
I wonder how often, as a child, you were told to “cheer up”, “to be a good girl or a good boy”, to “forget about it” or something along those lines? These comments are often very well intentioned and, whilst they may have their place at times, might well have left you feeling dismissed, wrong to feel the way you did, ridiculed even and certainly that your feelings were not very important.
As a human it is natural for you to have emotional responses to things and the better you get at supressing your feelings the more you can end up storing up trouble for later. The busyness of modern life only serves to encourage this as we move at high speed from one experience to the next.