Giving constructive feedback is hard. It's hard because of the story we create in our head. 

"The person isn't going to react well to this feedback."
"She won't like me for criticizing her work." 
"It will hurt our relationship."

The emotion or stress we feel often gets in the way of taking action to provide feedback. It gets in the way even when we think it's a good thing to do.

One solution is to reframe your perspective. Think about feedback as a gift. It's a gift even if it's negative feedback. It's a gift because you're helping your team member improve. It's a gift because your team member doesn't know how his behavior is creating a negative impact. 

Also, imagine what would happen if you don't provide feedback? The negative behavior will continue. So what's the cost of you not giving feedback?