Complicated MacBook Pro situation involving booting up (10.8.4)

So this morning I was just peacefully playing a game on my MacBook Pro when suddenly it just froze on me. I have been experiencing unusual lag spikes and freezes on it recently, which I thought to be odd, but I didn't really pay much attention to it. So anyways it froze so I had to manually turn it off; however, whenever I tried to turn it back on it wouldn't boot past the apple logo with a loading gear below it. During one of the freezes in the past few days the same thing happened and it fixed itself after trying to reboot it a few times so I didn't really worry at first. But after 4 times I began to worry. All day ive been trying my best to fix it and have watched numerous videos and read many of these posts to try and advance my efforts; however, I believe that doing all of this has royally broken my computer. During the videos and threads it told how to boot into safe mode and so I tried that. On average my computer takes about 5 times of being booted to actually get into the utilities menu (therefore I have had to manually shut down my computer a lot and believe me I hate doing that). But anyways I have done what the videos tell me to and I get strange errors that they don't. As a result I think that I have severely messed up my computer. Upon selecting disk utility instead of showing macbook he or whatever it shows "APPLE HDD HTS547550A9E384 Media" and "disk0s2" and lastly "SuperDrive". Whenever I try to repair the 2 first ones it just says there Are a bunch of missing threads or that there are missing information in the internal lookup - both of which end up saying that the disk cannot be repaired and to reformat them on an external disk. Then whenever I try to reinstall the os (yes I am connected to wifi) it simply says that it cannot be installed and to contact AppleCare. Now here's the weirdest part. I rebooted the computer and accidentally didn't boot into safe mode and the computer automatically booted into safe mode and keep in mind that it hasn't booted onto anything by itself after the malfunction this morning. I know I have no viruses and I just want my computer back. I don't care about the memory on my computer and am willing to delete everything if I have to. Sorry for taking so long in explaining but I think that you'll need all of the details. Please help me I love my macbook and would give anything to have it back (but I don't know if I trust geek squad). Thanks!

Update
Ok so now I just want to delete my disk and reinstall the os. I have used diskutil in the terminal to unmount the disks and as a result cleared up the problem "unable to unmount disk";however, now I get the error "POSIX reports: The operation couldn't be completed. Input/output error" if someone could please help me with this I just want to delete everything a reinstall the os.

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