I use to hate when my mom would say this. 
"You need to put that down. Take a break and come back when your not thinking about it. Then you can,  just do it"
You know she was always right. I hated hearing her say that. Because I knew she was right. Even if what I am doing she has no clue what it is. 
Take yourself a break, go fishing, hiking, what ever. Then when you haven't thought about shooting for a day, just pick up your bow and start flinging arrows. Trust me, it will work! Patrick