You
can do it. I did it
I really had to buckle down and struggle through the last few minutes but when I finished it was the best high I had ever had. I was totally freaked about it too but I just kept going. Just keep going. Sometimes I like to break down runs in my head into smaller increments, I like to think, I'll just run until this song is over or until 15 minutes is up. Then when I get there I think what a waste it would be to get this close and not finish it!
And yes, running slower is better then going fast and not finishing. I had to slow down and I still run slow. But at least I run!