SP+dreary

http://www.merriam-webster.com/dictionary/dreary

Dreary means sad or uneventful. This poem is about being different. The poet thinks that life is uneventful and enjoys not being in it.

Not sure Dickinson is saying that life is dreary, but rather that a life lived for the approval of others is dreary. She might be playing with the perception that being alone is dreary -- she might say that solitude is refreshing and enjoyable.