I run atleast 3x a week. When I started I had to push myself but soon I felt differently.
Everytime I run, I push a little further, run a little faster. I keep track of my progress and time my runs as well as measure the distance. It helps me to see that the hard work is paying off.
And honestly, the endorphins your body releases after a run make you feel awesome! I listen to pumped up music when I run for inspiration.
If you're just starting I suggest doing interval runs. Walk five minutes, run two, walk five, and continue. Next time switch it up, walk 3, run 4, walk 3. Keep changing until you just have your warm up, run, and cool down. Go slowly and trust what your body tells you it can do.
Just for informations sake, I also think lots of other activities are a great way to exercise and enjoy yourself too! I love many different sports, as well as yoga, and cardio. Although horseback riding is where my hearts at. Keeps you toned haha!
Anyways, that's my two cents.