Not excited about being a new mommy yet :(?

Im 20 almost 21 and I am 7 months pregnant, Im a military wife and have been with my husband for 6 years and married for almost 2 now. We have an absolulty amazing relationship. But, we had to leave our small little home town on the east coast all the way to the west coast because of his career. I had no problem moving except for the fact we both come from 2 Large familys were very close to (especially me) and We had no one not even friends here. Two weeks after moving here I found out i was pregnant and due in September...... my husband couldnt be more excited for our daughter to join the world but me on the other hand i just cant find the happiness....... I love her because i couldnt even begin to hate her and she's an innocent little baby but im not excited about being a mother and i havent been since day one. I know its our fault because we had sex, and i dont regret her but i just know i wasnt ready to sacrafice. I will without a doubt just suck it up but I hate being the only one of the 8 pregnant mothers here where we are that isnt blooming with that joy of mommyhood. How on earth am i supposed to get excited over it? Is it normal? My mother told me she was skeptical when she found out she was pregnant for the first time too but as soon as she heard the first cry of her little one she died of joy inside........ but i should be happy because it was next on our list of life..... my mom was 15 unmarried and broker than broke. Im just worried this feeling wont change because i know how I react and think and i want my daughter to have an excellent life and know she's loved.