I had sort of a similar experience. I hated all the dresses that I tried on until I found my dress. I mean I "liked" my dress when I first saw it but it wasn't exactly in my size either...so it was hard to imagine how it would feel when it was more fitted. When I went to view it after it came in, I thought I "hated" it....it was sooo big, especially on the top part. I wasn't really very excited to go back for my first fitting (which was on Sat). But once I went back, and they pinned it in the right places, and I had the veil on etc... I fell inlove!!
I think that the next time you go to see your dress (once it comes in), get your hair and makeup done! If you feel you look amazing, you will feel differently when you see the dress on you. Plus when something fits appropriately, it will automatically make you feel more comfortable! I think you'll love your dress in the end! not everyone is inlove with it right away. And I think its normal to maybe wish you'd kept looking or picked something else hope that helps