We don't have children but are way past the TTC stage - I'm 47 so it's now very much a fact of life.
TBH, I initially found your thread title quite offensive, though on reading the post I can get a better idea of where you are coming from.
Personally, I adore Christmas - we go down the poncetastic route with knobs on - hand made cards, lots of home made presents, lots of home cooking. Instead of thinking about what you haven't got, please turn it round and think positively about what you have got going on.
It helps considerably to have a plan. Depending on how long you and DH are off work, try to aim for a mixture of couple time, family and friends time. Start your own Christmas traditions - why not throw a party over the Christmas period? Plan a special menu for Christmas Eve, invite friends over for a evening of board games and fun, do great day time activities. Our local RSPB reserve often does guided walks or there are often activities at NT properties etc. We have lots of Christmas rituals including Muppet Christmas Carol on Christmas Eve, stockings for everyone in the house, etc... these are our traditions because we think of ourselves as being a family not as "just" a couple.
Just because you don't yet have your own Dc, can you involve DC in some other way? One of our favourite Christmas activities is our nephews coming over for a pre Christmas charity dog show that a local rescue organises. Boys get to dress up in fancy dress, enter a few classes, come home with rosettes, and we all have a blast. Why not take some DC to a pantomime? The theatre, ice skating? Make a big party of it and add some hot chocolate and a good time. Make home made presents - I do big batches of lovely fudge and truffles which are then given to various friends, DC etc.
When I was younger, and it bothered me, it would irritate when smug, childed colleagues would ask about our Christmas in a rather pitying way. However, when I reeled off the list of a week filled with laughter, entertainment, special people, planned activities and lots of nice time snuggling on a sofa with a wine glass, it would often end up with them looking rather wistful and saying how nice it sounded.
You may not have DC yet, but I can assure you that a Christmas without your own DC is possible, and can be made to be meaningful, rich, joyful and very, very special.