Advice For Running 1 Mile

Hi! So I have a question you guys might be able to help me with. I am a 35 yo man and I am training for boxing. Coach wants me to run 1 mile a day until I can run 2 miles a day and so in and so forth. I run 6 times a week on a treadmill at the gym. I run 6mph. So I average about 10 minute/mile. I've ran 15 total miles so far. So here's my question. I don't have air hunger until about 1/2 a mile, them I start developing air hunger with no other symptoms. How long will that last until I can run freely? I'm so new to running that I don't even know if that ever goes away. So additional info: I'm 5'10 and weigh 200lbs. I'm losing about 2 lbs a week. And I eat very healthy but only eat about 1700-1800 calories a day. Hope all this helps. Thanks!