Foreskins come in all lengths. Yours is a little shorter than most. It's perfectly normal and perfectly healthy.
You are actually experiencing some of the "benefit" of circumcision. Your glans and meatus are tougher and less sensitive than if your foreskin never retracted (as in cases of tight foreskins and phimosis).
If your meatus is never irritated from abrasion, you're fine. You can protect it from rubbing against fabric in you clothes to avoid this irritation. If it is or if you ever become worried about your penis losing too much sensitivity, you might want to stretch your foreskin out longer for better protection. There are instructions elsewhere on this forum: http://www.healthboards.com/boards/mens-health/178155-stretching-fix-tight-foreskin-phimosis.html