Is this depression?

I've been seeing a psychiatrist who thinks I'm depressed but I dont think I fit the standered criteria for depression and I dont relate to other depressed patients at all. In fact I cannot stand being around depressed people because their pessimistic and self-loathing.
I realize that I do have episodes however that come and go so Ill describe them a bit.
During these fazes I do not like anything or anybody. However I feel dissapointment and hatred toward our society.
It makes me not care because I feel an overwhelming sense of nihilism and misanthrope.
I have felt suicidal because I feel fed up with being here and have no intrest in being here.
I actually ponder why most people dont kill themselves. It will baffle my mind.
Even more so I feel homicidal and think about killing people on a regular basis even going as far as making detailed plans.
Others say Im grumpy, mean, unplesant to be around and dont want me around.
I become extremely insensitive towards anyone and am constantly irritated during these fazes.
Unlike someone with typical depression I always feel great about myself however. I think that anyone who is self loathing and feels like a failure is that just because they have such a pathetic point of view. I honestly could not give a shit about anyone elses worthless feelings.
Also most depressed people cry all the time. I never cry no matter how bad my mood is. In fact it annoys me when I see other people crying.
However these fazes come and go and while Im not feeling like this I just accept that other people are weak and stupid and force myself to have fun anyways and appreciate other people for the entertainment their good for.