HSDR:
Your lengthy replies in response to the multiple advice provided to you is indicative of your hard-headedness. You are smart and have clearly read enough to know the nomenclature, but I'm not so sure you're listening. Here's my summary of your thread:
You: must run hard to run faster, why am I slow, everything seems easy, I work hard, need to work harder, must run faster...
Everyone else: you are tired, you are tired, back-off, try something new, what you're doing is too much, rest, you are tired, what you're doing is not working, you are overworked....
How much longer can this go on?
I think your replies are redundant. Stop for a moment and dispense with your perceived justifications of your training and consider a new approach to your training.
Stop your interval work. Stop your LT runs. Stop your strides. Stop all of that.
Focus instead and almost exclusively on your aerobic fitness. Are you sure you are aerobically fit? How can you talk about LT workouts and the like if you don't know?
Have you considered running with a heart rate monitor?Perceived effort is woefully subjective - you might be feeling a lot better than what your body is actually exerting. On my very first run after acquiring my HRM, I was surprised to find out what I thought was easy was actually 93% of my max.
A HRM does not lie, your perception will. My advice is to go purchase a cheap one - a very good Ironman 100-lapper can be purchased on ebay for $70. Others are even cheaper than that.
Figure out your HR max (absolutely do NOT use the age formula) by doing this test (courtesy of Pete who posts here, but seems to me a modified Hadd test):
800 all-out, rest 30s, 400 all-out. Highest HR observed is your max.
For several weeks, steadily build mileage by doing nothing faster than 80% of your HR max. If that means 10 minute miles+, so be it (the idea is that as you get fit, your pace will drop with the same level of intensity).
If this all sounds familiar to all of you, well then here's the obligatory Hadd thread link:
http://www.letsrun.com/forum/flat_read.php?board=1&id=91048&thread=91048
This is important, if you intend to read - read all of it. You won't get the whole picture, if you read only parts of it. Also, I hesitate to give this to you because it is for those over 17 and requires high mileage. That said you should read it to get a sense of what a good aerobic base will do for you. You should be able to adapt the core principles to your training as I have.
I don't run more than 50 miles per week, but I have certainly improved for the better.
Never in my life would I imagine running as slow as 8:20 pace, but that's what I did for over a month (I ran 6:15 for my LRs in college). Now as my fitness has turned the corner, I am now running as fast as 7:05 for 18 miles at the same HR as when I did those 8:20s. I am still improving and that pace will drop even further.
Finally, ignore everyone that says you can't run on a D1 team. Every team needs a 7th man in CC. Ours could barely break 36 min in the 10K. We weren't a great team, but that's not the point. If your dream is merely to run on the team. Keep working on it and you may get there. Don't mistake running as your career - just learn to run and love it - no matter how fast or slow you are.