The 20-year-old frontman has spent the last 18 months farmed out to Alloa and Hamilton in Scotland's lower divisions.
But 45 goals in that time has convinced Perth boss Tommy Wright to give the youngster his chance.
And the confident forward said: "I'm taking things one game at a time right now but I am determined to play as many games as possible and score as many as possible.
"I'd like to get to double figures but that all depends on how many games I play."
May - who will line up for Saints against Hearts in tomorrow's opening Premiership fixture at McDiarmid Park - has already taken one step towards his target with a crucial strike against Rosenborg in the club's Europa League clash.
And the striker says he is ready to use the goal as a launchpad for his career.
"My goal over the last two seasons has always been to end up coming back and playing for Saints," he said. "I really enjoyed my time with Alloa and Hamilton but this is the season where I see myself getting my head down and playing as much as possible.
"I want to show that I can do well at this level.
"The goal against Rosenborg was the biggest of my career. I've scored a lot of goals and they are all good but that one was another level. The feeling I got running over to the fans was great.
"I've scored in the SPL before and I've never doubted myself but that will be a goal that I know I can look back on say it was a massive moment in my career. I'll always remember it."