<human>: I have a 10 mile trail race coming up on Saturday and I'm pretty worried about the heat. Dependent on how technical the trails are, I can run this distance in 2-2.5 hours, usually. I've been eyeing the projected temps and it's supposed to be a scorching 90° that day. Up to this point, humidity has been 95-98% first thing in the morning. 

Not only am I worried about running in the heat, but I'm not as trained as I would like to be. Life circumstances have prevented me from maintaining as high of a mileage as I normally would. 

Up until now I've been getting up around 6am to run before the sun starts beating down but the race starts at 8, and it should be around 75° by then. Needless to say, I feel underprepared and unsure of how badly the heat will impact me (I've run several days in the heat and it slows me down and makes me very sluggish, and forces me to sometimes walk). 

I suppose I'm looking for any bit of encouragement or advice. 

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Could you distill the essence of the text into 1-3 sentences?
<bot>: 10 mile trail race in high temps and humidity level, not as trained as I want to be, and nervous)