How can we let peace and joy stay in our hearts, as Christians?

I understand that being a Christian, one will have peace and joy. However, I am always feeling down. It seems the only way I solve my problem is to cry. I don't have many friends. I feel lonely. My son even prayed for me, "Jesus, please take away mama sadness and put peace and joy in her heart." I just don't understand why, but I'll cry always. 

Clarify (1) • Share • Report • Asked January 01 2014 • Anonymous