The Crab symbolizes your sign of Cancer. Sometimes, you need a hard shell to cover any vulnerable parts of your nature. Your feelings are easily hurt and, once they are, it's tough for you to move past them.
At times, you can hold a grudge, especially if the offender's not quick to apologize. Also inside that hard shell is a creative mind and decidedly visual imagination.
You're not always sure everyone will accept your ideas, but it's part of your purpose to share what your imagination provides. Your happiness may be found in the arts. You just may need to develop a thicker skin.