Resting Heart Rate?

There's no way you're getting enough recovery with 2-3 workouts and a meet every week. I was killing myself by not taking easy days my senior year, I should've been improving on my 800 PR of 1:56 from my junior year but it took me until State to break 2:00 as a senior. I had that same "dead legs" feeling every race, despite my RHR being in the 40-45 BPM range. Talk to your coach about taking a recovery week before your next meet, maybe only doing the Monday workout and then all easy runs (~7:30 pace) until the meet. If he doesn't let you, just sandbag the workouts as much as you can without pissing him off to the point of benching you.

HR readings are like the experiments you do in bio class... according to the text book it's supposed to turn out blah blah blah, but it almost never does. There are a lot of variables and you need to control all of them for a comparison to make sense. For resting HR those variables are hard to control, so usually you keep track of a running average. It CAN BE an indicator, but not necessarily so.

But if you feel good, you feel good. If you feel burnt out, what's the harm of backing off a bit?

If you're burnt out take a chill pill and chillax brah! Take a mental health day and grab a cold one and play video games.

your resting heart rate can be used as a monitor of your overall health. if the following are true. 1. you always measure your resting heart rate the same way, at the same time of day, under very similar circumstances. personally, I do mine when I wake up in the morning, before I even get out of bed. 2. if you monitor it regularly (not necessarily every day, but 1 - 2 times per week). then, if one day it is noticeably higher than usual, that can be an indication of one of three things: 1. you are going down with an infection or illness of some kind and your body is working hard to fight the infection. 2. you are suffering a stress of some kind (which might be overtraining, or under recovery, but it might just as easily be worrying about exams, or how to tell your dad that you lost your bike). 3. you didn't sleep very well last night, which might itself be a sign of over training but it might also be lots of other things. just not being properly hydrated can affect your sleep. in your case, you took it three months ago, and you took it today, and comparing those two isn't going to tell you anything very much. they are essentially just two random numbers.

I feel like I'm burnt out because I can't even run a pr right now

not being able to run a pr is pretty normal. a pr is, by its very definition, a rare and special thing. just because you haven't run a pr doesn't mean you are burnt out.

you might be burnt out, but not running a pr doesn't tell you this.

am consistently running 5:02-5:12 for about 8 races in a row

consistency is good. if your times were getting steadily worse that would be worrying, but consistency is usually a sign that your body is handling the stresses you are throwing at it. obviously, to improve, you need to do more than just handle the stress, you want to adapt to it. and I would agree that your training schedule seems to be giving you little scope for adaptation, and with only one race left, you are obviously keen to respond to the training and make that big breakthrough to sub-5.

I don't think you are classically overtrained, but you would almost certainly benefit from a proper taper for your final race. speak to your coach and see if you can reduce the workload in the final two workouts and maybe even omit altogether the one two days before the race.

cheers.