Talk to your pastor. My church has a special mass for graduating seniors every year, but I’m not sure how exactly that got started. I’ll bet you won’t have much trouble convincing your pastor of having a mass like that. Good luck and congragulations on graduating! (my brother is graduating this year too)
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.