Hey, just keep training - you'll get fitter with time.
Jogging long distance (over 20 minutes) is good for the heart.
Alternating between sprints and light jogging (15-20 minutes) is good for building up your legs and endurance.
Also, it depends on your age, if you're 13 or younger you probably want to stick to jogging.
So ya, just keep at it.
Feeling out of breath and tired are mostly a result of poor running form. To the lucky few, poor form only makes them tired because they are expending more energy than they would be with good form. In other instances, poor form can lead to chronic pain and repeated injuries--especially to the shins and knees.
A good way to become a better runner is to develop strength in the glues, hams, hip flexors, and calves. Of course the core too. But fundamental is good form. Make sure you're driving yourself from the glutes and the hips. Glute activation is key. Look it up, and you'll find that it's fairly easy to achieve, and the results will be quickly noticeable. Second, is your stride length: don't over extend or hold yourself back. Your front foot shouldn't extend beyond your center of gravity; avoid heel strike; and finally when you've got your form right, you can give your "the kick" with your back leg, which adds speed effortlessly (of course you need good hams and calves for this).