Try to cut down the unhealthy fats you eat and do more cardio after your cheer leading practice
I did start running about 2 years ago. Almost 50 years old. It took about 1 year until i did like it! Most important is to build up. My coach was and is micoach from adidas. You canfond it on the net. I did notice that i did overwhelm myself all time before when i did tryto run and did get the same problems you're writing about each time. You'll manage it! ! I'm sure!