| Is it possible that I'm just not built for running?
Some background.
I'm 23, male, and graduated from college last December. I joined a gym in February and have been going quite regularly. I'm 5'9, about 170 and have a reasonable amount of muscle, probably average bodyfat. I've never been athletic or played sports often. In fact before I joined the gym I was quite out of shape and never exercised.
Only thing is, I just can't seem to run long, nor can I sprint that well.
The fastest I can run a mile is between 8 and 9 minutes (although, to be honest, that's better than it was six months ago), and after that I'm pretty winded. Typically I'll get on a treadmill and run about 4 miles, but I have to stop for walk breaks periodically, although I admit I probably do a poor job pacing myself. That said it doesn't seem like I'm making a huge amount of progress, but then again I'm not sure how much I should expect in 5 months.
One thing worth mentioning is that I'm fairly bottom-heavy for a guy. In other words my upper body is pretty lean but my legs are big for my size (it runs in the family). Is it possible that this makes it harder for me to run?  | 
