Need to Find a Motivator

I clearly don't have a huge drive to stick to a plan, but I'm getting better at it.. I started going to the gym again, and I haven't done that in a while.. The big kicker to getting myself back to the gym was the fact that I got up to about 150 pounds and I didn't fit into my size 7 (stitches sizes) jeans, or my boyfriend's old jeans for that matter, which I did fit into at one point.  It made me sad, so I asked my mom to bring me to the gym with her, we make appointments with trainers in Brampton because they are so much nicer there, and we work out a bit at our regular gym up the street.  I am trying to cut back on my junk food, and eating healthier and smaller portions, Last time I checked my weight I was down 5.5 pounds, and that was on Wednesday I think.  I am going to the gym tomorrow, and trying to work on getting down to about 120-125, hopefully by Thanksgiving (the Canadian one)