I drove myself crazy trying to run as fast as others, or what I thought fast was. I'm 53 ,and I run a 9 minute mile depending on the distance (and that's good for me.) I did a 1/2 Marathon in 1 hour 59 minutes ,and I was Ok with that. Listen to what Sey said...don't injurer yourself. Its not worth it. Now that I'm trying to run again I'm probably running 10-11 minute miles. Just enjoy yourself.