In chapter 4, Nephi talks about how he feels unworthy and weak at times. If even a great prophet like Nephi can have these troubles and doubts, no wonder I have troubles! I just need to follow Nephi's example and trust in the Lord.
verse 34: O Lord, I have trusted in thee, and I will trust in thee forever.
I had a seminary teacher in high school who wrote a song based on this chapter. He called it Nephi's Psalm. It's beautiful. And always brings me warm memories of listening to Brother Kunz sing to us in seminary.
If you want to hear the song: http://www.metacafe.com/watch/2346697/nephis_psalm/