Losing Weight Impossible?

So when I first got my dress, it was wayyy too big and I had it altered about a year ago before I knew my wedding would be postponed to this year. Well with COVID and stress and let’s be honest, boredom.. I’m not the size I was when I had it altered. I know I still have a little more than 3 months but am I being too hopeful that I’ll be able to lose the weight in time? I’ve tried to diet about a million times now but then I end up caving and snacking. I know I have to hold myself accountable and having my dress taken out just isn’t a possibility but maybe someone can relate to me and make me feel like I’m not bonkers for being so worried about this 😬