Called to Serve.
“God never tires of forgiving us; we are the ones who tire of seeking his mercy.”
Pope Francis, Evangelii Gaudium: The Joy of the Gospel
Maybe it's been awhile since your last confession. That's OK. The important thing to remember is that there's no sin you could have committed or length of time since your last confession that disqualifies you from going. In fact, the worse your sins or the longer since your last confession makes you all the more qualified for a good confession!
If you're nervous, try to remember that there is no condemnation in the sacrament, only love and forgiveness. Jesus never turns away those who seek His mercy. Check out the links in the right column for some helpful resources that will make your experience as smooth as possible.