Staying motivated.

Hi everyone! I have been on my weight loss journey since 2013. I started off weighing in at a 187 pounds in Jnauary 2013. I am 5'3". My goal was to get down to 140-145 pounds, but I never made it. I got down to 153 pounds about 6 months after I started and after that, the scale wouldn't budge anymore for months on top of months. My weight fluctuated between 155-160. Eventually I gave up and when back to my old eating habits, but I was still watching my calories only I wasn't as strict. Over the past 6 months, I've managed to gain about 10 pounds putting me at 168. I knew I was headed back down the wrong path where I fought so hard to come from before, so that made me get up and get it started again. I exercise at least 5 days per week, sometimes 6 doing mostly cardio (jogging/brisk walking 2 miles, treadmill with an incline at a brisk pace, and running on the treadmill on a slight incline) and maybe 15 minutes of circuit weight training on days where I'm not so tired. I get so discouraged sometimes because I have a ways to go to get to my goal and it gets frustrating. My worst fear is doing what I'm supposed to do, counting calories, exercising regularly, and not reaching my goal. It's hard, but I am trying not to give up this time. How do you stay motivated?