It took me For. Ev. Er. to get "good" at jogging. I didn't use a formal program when I started (about 6 years ago now), I used my iPod, and set up playlists where I'd run for one song, then walk for two, and so on, until I finished whatever amount of time I was supposed to be exercising for. As I built up endurance, I shortened the amount of walking I did between the jogging sets, until eventually I could just jog, but it took me at least six-ish months to get to a point where I could just jog continuously for a mile or two. Now, six years later, I'm training for my first marathon.
It's completely normal to take awhile to get better at jogging - just know that if you keep going, and if you go at your own pace, you'll get there eventually.