Hi Lauren! Motivation is definitely a hard thing to come by, I think. I assume you've already tried picturing yourself at your goal weight. Personally, I was prompted to change my lifestyle after looking at myself in the mirror and being totally disgusted with what I saw. I was at the heaviest I have been in my life and I hated it! I couldn't wear any of the clothes I wanted, I couldn't do the physical activities I wanted to because I was too out of shape.
A year or two ago I started getting into fashion and beauty, which I had never paid attention to before. It hit me that I could wear the right colors and blow-dry my hair right and apply makeup, but none of that would cover up my fat belly and gigantic butt. Also, I started to feel uncomfortable getting intimite with my boyfriend, which had never been a problem before -- just because of my stomach. I got really fed up with it and decided that it was time to fix it! I had the advantage that I was moving to a new place and starting a new stage in life, so I didn't have anything in my house to get rid of, or any restaurant habits to break.
I was the least motivated with exercise, because I was so bad at it and it seemed so time consuming. But I found that if I go in the morning, I can stick to a routine, and now that I have been working on fitness for a while I actually enjoy it and look forward to going to the gym! I have hated exercising my entire life, because it was so hard for me, but after a few months of going 3 days a week, I finally feel like my body is thanking me and I am accomplishing something great. It's just as good a feeling as I had the other day, when I was lying on my back in bed and I could feel my hipbone under there for the first time in years!
I don't know if that helped you at all, but I know you can do it! We're all here to support you.

Think about how healthy and beautiful you will be when you reach your goal!