Hi Lauren,
Way back a million years ago when I was in high school,I played varsity basketball and softball.I was a great practice player at basketball but I couldn't relax and let it rip during games.Looking back I think I was self-conscious because I wasn't confident about my skills when among players other than my teammates.I was a holy terror on the softball field because I knew that my skills were the equal of anyone.I guess the parallel I am trying to draw here is that if you are concerned about your run performance you may be holding back subconsciously on the bike.I agree with KSH,just pick a C race that doesn't really count in your season and tear it up,girl. I bet you will surprise yourself.I'm a firm believer now that 1/3 of the fight is training right,1/3 is proper nutrition,and 1/3 is mental.Good luck and keep us updated.I am going to use KSH's advise on my 2nd tri in September,I believe it is great.