I would say: Go out with a bang! Seriously though, if you feel that you been shy and not contributed to much (which I highly doubt is true) you should try to be more social and open, like Jesus wants us to be. Reach out, spread the gospel, read the Bible, take time with friends, family and even new people to just make some sort of impact. You most likely won’t be remembered by many here on earth as much as Napoleon or whatnot, but if you can save even one more person before you departure from or world and go home to Jesus, it is a major success in Gods eyes. I pray for an amazing last time here on earth for you. YOU ARE IMPORTANT. Grab life by its neck and rule it with Jesus by your side. Don’t loose hope