The former BVB man wants to boost his confidence and become an influential figure at Man United after a successful but unspectacular first year in England
The Japan international midfielder was rotated in and out of the Red Devils side last season, partly due to injuries, as they charged towards their 13th Premier League title.
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"I wasn't satisfied with my overall performance but I played well in the second half of the season and started to get more and more confidence," Kagawa told Sports Illustrated.
"Hopefully, I can keep that going at the Confederations Cup.
"In this business, you need to be like Wayne Rooney or Robin van Persie and prove yourself if you want the ball. I want to be a player like them, which means I need results."
The former Borussia Dortmund midfielder made 26 appearances in his first season at Old Trafford, finding the back of the net six times.