Very high heart rate during tempo

How do you feel on your tempo runs? Are you feeling fast but in control, or are you thinking "oh crap I'm about to hit the wall this sucks" the whole time? Are you looking forward to your next tempo run because it leaves you feeling invigorated, or are you dreading the pain you know is coming?

If you feel in control and you're looking forward to the next one, ignore your HR. It's just a guideline and one of several possible criteria to tell you if you're in the correct range, not a number you're supposed to hit. Or if you think you've been running tempo runs too fast, slow down! It's only July.

185 average is 89% if your resting and max HRs are correct. Sound right to me.

I feel in control for most of my tempos. I definitely have to focus more mentally after about 50% through and significantly more at ~85%, but that's a normal process because of the hydrogen ion buildup.

You are young. Your heart rates are normal.

Just run them at a comfortably hard pace and don't obsess about the HR. It will self regulate based on the conditions, fatigue levels, how much caffeine you've had, and other factors. At 18, your HR's are going to be high.

Assuming that you are running your tempos at the correct effort level, having a higher during tempos is actually not a bad problem to have. Believe it or not, being able to sustain a higher % HR max during tempos, often indicates you have a excellent lactate threshold. This is why well trained runners have a lactate threshold at a much higher % HR max than novice runners.

Hope you didn’t get any “vaccines”

Many athletes dropping dead. Lying media, calling it Sudden Death Stndrome.