I struggled so much when I first started gym classes and I felt like the idiot of the class!
But it's all about progression, and commitment. As long as you keep going at it, you will be so much better without you even realizing!
Looking back on my fitness levels since I started the gym, I don't even know the point where I went from being unfit to being super fit! And its such a great feeling once you get over the first bump. I mean, I couldn't even run for 10 minutes on a treadmill, and now a year and a half later and I can squat my own body weight??? You will get such a good feeling once you achieve a few small goals and then it becomes addictive!