It reminds me of the story of the basketball coach who needed to motivate his players to persevere through the remainder of the season: 

He asked his team, "Did Michael Jordan ever quit?"

The team responded, "No!"

"Did UCLA’s great John Wooden ever throw in the towel?" he yelled.

"No!" hollered back the team.

"Did Kobe Bryant ever quit halfway through the season?"

Again, the team shouted, "No!"

"Did Seymour McDunn ever quit?"

The players were suddenly silent.  They looked at each other and, finally, somebody asked, "Who's Seymour McDunn? We’ve never heard of him." The coach snapped back, "Of course you never heard of him … he quit!"

Wanting to quit or feeling uncomfortable is just part of confronting risk.  Not giving in will help strengthen your ability to take setbacks in stride.  At such times it’s best to take your own investment advice:  don’t make emotional investment decisions, and stay the course.