Not Sure If I Have Tinnitus?

Watched “Beethoven Virus” and learned of Tinnitus, thought I might have it despite still being in high school. I read a bit about Tinnitus on Wikipedia and elsewhere, but I’m still unsure as I don’t listen to loud music or anything of the sort. In fact, I tend to listen to music as soft as I can because any louder and it’s extremely uncomfortable. Often times I’ll hear a constant, but very soft high pitched sound at night in my room; could it possibly be because of the electronics in my room such as my laptop, speakers, cell phone? The iPod Touch/Phone dog whistle or whatever application produces a similar sound to what I often hear, hence my extreme dislike of it as it gives me slight migraines. But on rarer occasions will a sudden, loud, yet not ‘forte’, ‘pitched’ sound come out of nowhere and then disappear. This louder sound is something I’ve had since first grade in elementary at the least, but due to the large gaps in time, I have neglected it until now.
I’m unsure about whether I have Tinnitus, as well as whether or not I should see a doctor.
Would be grateful for an answer,
Thanks! (: