Anyone Else Not Excited as the day Gets Closer?!

My fiance & I are gong to city clerks office to get legally married on 12/18/19. I have always been partial to just "going to the courthouse & getting it done", and he's always wanted a "real" wedding ceremony & reception/party afterwards. I caved in and said fine to that, as long as it was something smallish, not anything unreasonable or exorbitant. He didn't care about the date, so I picked New Years Eve, since I've always liked the whole ringing in the New Years and the kiss and all that. We both don't have much in the way as for friends, and not a lot of family either, but altogether we expected to have about 30 - 35 people. We planned to have the ceremony & reception at his mothers house. That's all fine, that's been set. I planned out the short ceremony & reception, and the music and how it will play. I ordered chairs (there was a 50 chair order minimum), and invites (again, 50 card/envelopes minimum), I got my dress, he got his suit & tie, we got the rings, the license, and I ordered all the decorations and know where everything will go. On top of that, I planned a whole menu (a few catered stuff, but mostly southern home cooking by his mom & granny), including hors d'oeuvres, and cupcakes for people who might not like the custom-made tiramisu wedding cake we ordered (big enough for up to 30 people). When I told people about the engagement, a lot of them wanted invites, so I invited. For some unforeseen reason, a lot of them didn't really think I'd have it on New Years Eve. Well, surprise...I am! And now a lot of people have canceled, including family members who should be there (ie, my fiances father, a cousin, and most probably now his sister cannot come with her kids, and 2 of my brothers and an uncle & aunt aren't going to come). It's a real bummer, because I never ask my family for anything, we aren't even very close, and me and my fiance have paid for EVERYTHING for this wedding out of our own 2 pockets. We aren't going on a honeymoon, nor do we have a wedding registry, or even a photographer for the event. For pete's sake, the music will be played from a playlist on my laptop, through speakers! All we wanted was for people to spend the 4 hours with us to celebrate. It's really bringing me down because here we are, three weeks away, and we are now down to only 18 people who will be there, including me & the fiance. I am no longer excited about this wedding. Everyday I'm nervous that another person will tell me they cannot come. On top of this, I did all the DIY decorations & parting gift candy boxes by myself (like i mentioned earlier, I don't have many close friends, and my mother passed away, also in December, 16 years ago). For reasons I am not at liberty to share, my fiances mother is unreliable, and he himself has been in his own world. So I did everything myself. And not even begrudgingly. It was fun to do. But also left me feeling sad and just not excited anymore. Anyone else feel this way or have any nice words to cheer a gal up??