Aftermath of "Summer Vacationing"

I don't know what is going on. I feel drowsy, bored and unmotivated from the moment I wake up to the moment I fall asleep. It can't be desperation because it is causing desperation. It doesn't make sense that something causes itself. Or does it?
It'll be a daunting vicious cycle that I can't break out of then.
All I know is that it's making me quite unhappy, the fact that I am unproductive and lazy. I don't feel tired half the time, yet I always manage to find a way to place myself in my bed and on my laptop, surrounded by chocolate wrappers, chips bags and guilt.
At brief moments where I say "ok, this is it! I will get up and do something," I soon find myself occupied with something else. It's quite disappointing. I feel like I am constantly disappointing myself. What's worse is that I am disappointing others, too. Yay me.
I have to admit that I thought this was a normal thing at first. But then I realized that I am becoming short-tempered and impatient with others. I fucked up my sleeping patterns, which meant that I only saw my family members if I was awake when they were, which was like, never.
Normal, some might think. I vouch to disagree.
Everything is normal until you start to feel bad about yourself.
The thing that's making me so upset about it is that I look back at the person I was a year ago, back in high-school, and I think what in the fucking hell happened? When did I become so lazy that I can't even draft a CV? When did I resent my extended family to the point where I'd cuss them out in front of them. Oh wait. I did used to do that.
That's not the point.
The point is, I need to throw all this negativity away or else it will become too overwhelming at some point that I won't be able to deal with it.
 I need to change. Right now.
Here's to change!