Gotta get my head in the game

I just got home from a beach wedding.  It was an awesome time, and I had a great time, but I wasn't happy at all with the way my dress looked on me.  It rolled up on the sides and left a bunch at the back.  I was worried about it all night and couldn't stop thinking about it!  It's time I do something about this weight for good!  I am not happy with it, it does nothing for me...but I can't seem to stick with any diets or anything!  It's getting so frustrating to me.  I know I can't wake up tomorrow and be skinny, but I just want to wake up tomorrow and have a different view mentally with everything.  Its like I KNOW what needs to be done, but I just can't seem to figure out how to stick with it!  I seem to just give up!  I love food, and that's what makes it so hard.  I don't want to miss out on anything.  I need to just get it in my head that this is going to be best for me and that I will be so much happier if I get over the bumps along the way.