The Saints midfielder admits he will not be happy with watching the majority of next season from the substitute's bench at St Mary's, despite his tender years
The 18-year-old, who this week heads to Turkey for the Under-20 World Cup with England, started just three Premier League games last season and made 11 substitute appearances.
Ward-Prowse is just one of a number of highly-rated youngsters to have came through the Saints' academy in recent seasons and is desperate to prove his worth.
"I am only 18 but I'm not content sitting on the bench," Ward-Prowse told BBC Radio Solent.
"Now I'm almost established and I need to make that next step and hopefully establish myself in the side.
"I don't think I've proved myself. I only would have proved myself when I'm playing week in, week out.
"Sitting on the bench is not what I'm about. I think I've got so much more to offer the team and the club and it's a horrible feeling having to sit on the bench and watch the likes of Luke [Shaw] doing well because you want to be out there contributing as well.
"The pressure is even greater this year. I'm 18 now, I'm no longer the young pup of the team when I was coming through.
"Now I'm almost established and I need to make that next step and challenge Jack [Cork] and Morgan [Schneiderlin] for a place in the team and hopefully establish myself in the side as I did at the start of last season."