Nerves

So, as I have mentioned I am doing a triathlon as a relay tomorrow. I am doing the run portion. It is a 10k. I have run 6.2 miles so many times I can't even count....why am I so nervous. I know I can do it. I am just so used to running for ME, just relying on ME...but because this is a TEAM I don't want to let anyone down. I spoke to the other two girls and we are doing this for fun. We are just considering this to be training. No big deal. We are going to have fun. I MIGHT sign up for the YMCA tri next weekend. I have until Thursday to decide. I like the fact that it is a pool swim.