Chemical imbalance ?

I'm 19 and I've done quite a few drugs. Acid, Mushrooms, Coke, Weed, Exctasy, and Salvia to name a few. I've been told my family has a history of mental illness and that I may have a chemical imbalance.

Here's the problem: Friends I've had for years have started to take on a very sinister demeanor, they whisper to each other and sometimes I catch them saying things like "I hate him". It is fine with me if that is the case but I'd like them to tell me and have asked them to tell me but it seems to me that I am just losing it. I get severe tunnel vision at times and can't concentrate on what people are saying to me... recently I've started to think that maybe when I have tunnel vision it is because other people are controlling me.

I've begun to support these delusions with facts in my quest to prove that I am sane. The parasite Toxoplasma Gondii is acquired from cat feces and is known for it's ability to control it's host. I beleive I have contracted this parasite from... even as I'm writing this I see how insane it looks... my ex-girlfriend and that my roomates (who have all had sexual relations with her) are also infected. This parasite is sent from the earth to control the human race and ultimately destroy it in order to stop us from ruining the planet.

Now after reading that, in your opinion, am I schizophrenic?