I look ugly in my wedding dress

my dress finally came in and I look horrible in it. I left my hair natural (I don't like my natural hair) and I hadn't put on any make up on. If I have no eyeliner on and my hair isn't straightened I feel ugly. So I'm hoping that was a big part of it. I've been trying to lose weight and get healthy for the wedding. I lost some weight but it doesn't show at all and I'm so sad. I loved that dress so much. I was so excited to be able to put it on again. It cost me an arm and a leg and I'm so scared that I just bought a dress I don't feel beautiful in any more