Egocentrism has to do with failing to understand that others may be experiencing an object or event differently than you are. Egotism, on the other hand, has to do with failing to appreciate that the needs and interests of others are as important as one's own. Egocentrism is a cognitive domain largely independent of one's personality, while egotism is a personality trait that is largely independent of one's level of cognitive functioning.
Internalising conditions are defined by what a person feels inside-thoughts, emotions, bodily sensations-that may not be visible to others. Take depression: although it can involve externally observable changes like altered sleep, appetite, or activity, its essence is often thought to draw heavily on internal, subjective experiences: lowered mood, emotional blunting, feelings of guilt, and rumination. The same is true for anxiety disorders, where excessive worry, dread, and tension are core criteria.