It's going to take a lot more than empty thoughts to shift so dramatically. I'm a night owl like that too, but I don't have to be anywhere so early in the morning.
What you need to do is change your whole routine. Being forced to get up early for school will help because you'll naturally be tired early from lack of sleep the night before. But, getting your body to shift will probably take about 2 weeks before you start to feel adjusted.
Here are a few things to try to help:
In the evenings, decide what time you need to be in bed in order to get enough sleep to wake up when you need to in the morning (you know how much sleep you need). Then, an hour or two before you are ready to go to sleep, switch to quiet activities in dim light. Turn off the computer, turn off the bright lights. Don't do anything too active. Let your body slow down. Take a shower, or put out clothes for the next morning, or sit on the couch folding laundry. Anything that doesn't require a lot of light or activity.
In the morning when you wake up, do the opposite, turn on all the lights, make yourself be active (even if it feels like you're going to die doing it...I know how early morning feels to a night owl).
Avoid caffeine pretty much past noon. If you're a coffee drinker, have your morning cup if you need it, but don't overdo it. This is the hardest part for me because that first day the thing you really want is caffeine to get you through your afternoon!
Resist taking a nap early.
Eat meals at scheduled times for the schedule you're trying to adapt to and don't skip breakfast, you'll need that energy and the food helps your body know it's supposed to be awake.
Stick to this schedule even on the weekends. The biggest difficulty people have with Mondays is they sleep in on weekends and then their body is off-schedule again for Monday.
There are people who have bona fide sleep disorders too. Delayed sleep phase disorder is due to a circadian rhythm that does not properly synchronize to daylight so it shifts later and later (the classic night owl). Advanced sleep phase disorder is the opposite, you shift earlier and earlier (morning people who wake up at 3 a.m.). These have been linked to mutations of genes encoding parts of the circadian clock. However, diagnosis of these would require evaluation at a sleep lab, and you need to rule out other reasons first, such as caffeine, alcohol, activity, lights on at night, noises disturbing your sleep, other physical ailments such as sleep apnea, etc.
Or, you can keep moving west. Haven't you always wanted to study in California? If you turn into a night owl there too, Hawaii is great, or New Zealand. Just work your way around the globe in a westward direction
You say your muscles were tired, but you couldn't sleep.. at what time did you go to bed that evening? Don't stay up too late, because you will get over your sleepiness and find yourself twisting and turning all evening. The beach really should have made you sleep sound.
