What's the right motivation?

So I'm just plunking along. Down another pound but the January enthusiasm wanes quickly. Got a scare today with a request to be in a wedding party.  That is exciting and maybe adds the external motivation I need to kick this into a higher gear. It's one thing to be chubby in my own photos, decades ago when I got married my mom wanted me to postpone my wedding so I could lose weight. I didn't postpone and even followed the vegan diet plan she put me on for 2 months prior but I couldn't tell you what I lost. Next wedding was my sister's. She found her dream bridesmaid dresses, bought the 10 for her soon to be sister in law and bought me an 8 and 6 so I could sew the two together to make one dress. But this time around I have 15 months to get in better shape. I can do this.