Literally, this is talking about when people attack/oppress you because you are a follower of God. But, personally, I struggle in many things both in things for and not for God. And When I struggle, I complain. I pity myself. I pray to God that God may take away all my struggles.
This illustrates the heart that we need to have. Whenever we struggle we need to turn to God and only God. Not career, not boyfriend/girlfriend, not tv, not friends, but God. By turn to, I mean deriving confidence and joy from him, and not asking him to make my life perfect.
Verse 13, in my opinion, is the verse that stood out to me the most and puts all my suffering into perspective. If we truly internalized the statement in verse 13, we would not complain. We would not mind our suffering. Why? Because we were dead. We were lost. But Jesus Christ saved us. Whenever I begin to pity myself and complain, I have to ask myself, where is my faith? Christ died for me so that I can live. OMG!!!