I did my first 7 miles yesterday, but my nipple chafing problem can't be ignored any longer, they're sore as fuck.
Lots of runner have this problem, you can put a small bandage on your nipples, otherwise you might want to try different kind of running t shirt (made with different materials) to see if it can be solved that way.
Oddly enough I never got this problem until I ran a half a few months ago where my right neeple was bleeding heavily by the end, I'm still unsure of the exact reason as of today lol (it was raining and it wasn't the first time I was wearing the t shirt I wore back then)