Race tomorrow

Most of you probably know this. You're training is going amazingly and then just one lil thing pops up and your done. Most of it was a mistake on the person's part. I over stretched my calf and I basically caused myself shin splints. I'm not sure if it was just that or the drills and/or the weight training I did later in the day. (this happened last week.)
but its just a bummer. I'm mostly speed when it comes to running races but I don't know how good my cardio can even become because I've never put in two 20 mile weeks in consecutively.
I'm not really complaining. Everything happens for a reason and I never wish that I was not hurt. I liked it because it humbled me and I have a appreciation for running. Maybe the reason that I am so addicted is because I don't know how good I can become and because I want to know that I can do this running thing right. I strongly feel that once I can work myself up to 40 mile weeks for base training, I can be one of the better distance runners on the team. But we'll see, I've never been a good natural distance runner. In 5th grade I barely broke 10 minutes. lol. I was trying really hard too, thats the sad part. In 8th grade my PR was like 7:30 or something. Of course that is without running except for the mile once a week for PE.
Maybe I just needed to let my body mature?
Anyways, I have a road mile tomorrow. My realistic goal is to break 5:15. I haven't been training for the past week and my left shin is not happy with me right now, but I know that if I run and put myself through the kind of pain that I know that will get me a 5:15, then I can do it. (I dont think that last sentence was set up or said very well lol) My above and beyond goal (yes I do call that my A goal. This is how I set it up. I make three goals. The C goal is the goal that I know that I can meet. If I don't meet it, I won't be happy at all. My B goal is the goal that if I reach, I'll be happy with myself and one that I am pretty sure that I can do. My A goal (above and beyond) is basically my breakthrough goal. Just for this race though, my C goal is rather wimpy because I've been sick and I haven't trained for a week. So, we'll see how it turns out. I just need to run hard enough the WHOLE time to where I feel like I'm not getting enough oxygen. It takes the stress out of running. Just run as fast as you can until you get that feeling, and you don't have to worry about anything else. Doing your best is not being able to breathe (or at least in my case).
Anyways, in the Mcmillan running calc, it says that I can break 5 minutes. We'll see though...