Dream about self in coffin is an omen for your confusion about some issue. You are being territorial. You need to expand your knowledge and learning. Your dream is a harbinger for your desires to stay connected with others. Perhaps you need to express some gratitude to those who supported you along the way.
Self in coffin dream is a sign for your self and your belief system. You are expressing your anger in an ineffective way. You may feel nervous about exposing yourself and are feeling a resurgence of those old emotions and feelings. Your dream is a clue for old age and issues about aging. You are acknowledging and releasing emotions you have repressed.
If you dreamt about self in coffin:
You may find that you have conflicting feelings about what to do next. It may help you to take some time out to quietly reflect on what your deeper nature is telling you, to discover how you really do feel, as opposed how you think you should feel.