I've been Spied On

So big brother's eyes are on me I found out today. I am 99.999% sure that someone was spying on what I do on my computer at work. It was kind of annoying I have to admit, because, really, why me? I have a college degree, I have kicked ass, I get a LOT of work done (and do it well) and I am still being treated like I am 5 years old. Is it just the company, or are a lot of big corporate companies like this? I don't get it.