Spurs meet Chelsea tomorrow at Wembley in the Capital One Cup final.
Mason started their FA Cup win over Chelsea, but was forced off early with a hamstring.
"That game against Chelsea was bittersweet," he told the London Evening Standard. "I was absolutely devastated to come off but just to be at the game - a great occasion for club, everyone at the top of their game, amazing atmosphere.
"Can that result give us confidence for the final? Of course. We believe we can beat any team and we've got a very young side. Everyone is excited about playing Chelsea and we hope it will go our way.
"To walk out at Wembley is the pinnacle and to do it for the team I have always supported is massive. There are a number of us in the squad who have come through the system and we are quite close knit. Some of us have known each other for seven or eight years, even more in some cases, so we have a fantastic relationship as a team.
"That friendship just gives you that extra desire to run for your mate. It's that extra five or 10 per cent."