There is only one of each of us!
That automatically makes everyone "unique" or special even if we're only talking about finger prints and DNA.
However our personalities, dreams/goals, outlook on life, point of view/opinions, likes/dislikes, along with our interpretations of the things we experience in our lives.
Having said that much like "beauty is in the eye of the beholder" so is being special or unique to others. Someone may fall madly in love with you while another could never imagine dating you! What is special to one person is not special at all to another. The healthy approach to life is not to rely on the outside world to make you feel "special". Self-esteem is a gift you give yourself!