I'm Jealous, Ask Me How...

First off, I'm a newbie here so I'm sorry if this thread is in the wrong place and I know there is already a thread entitled "Jealousy" but I feel that the two contexts are different enough.

Anyhow, so here's my deal. I'm coming to terms with the fact that I'm probably...most likely...maybe...definitely, bisexual. See, progress? :P Now, I don't really consider myself a jealous person, sure I might have been less inclined to share my Play-doh as a child but for the most part, I think I'm fairly rational. At least I was, until she came along.

Anyway, yesterday in class I arrived late and some dude had taken my seat next to her. So they're talking with each other and all of that, which I notice like the stalker I am, but she also seems to be glancing over at me. It was driving me mad the entire class though, her talking to "the dude," like I think I might have even growled inwardly of something.

So yeah, the whole point of this post was that I know next to nothing about this girl, don't know her age, last name, what Disney character was on her thermos in kindergarten...but I do know her first name, so points for that, huh. But there is no rhyme, reason, or right for me to be jealous and yet I wanted to punch striped-sweater dude's face in, and he's a nice guy mind you.

Anyway, I was just curious if anyone has ever experienced this kind of thing, whether it be just the strange pull to someone or the totally unwarranted ownership-y jealous bit...or maybe I'm just crazy, which is most likely a definite possibility but I'd really appreciate reading your comments regardless!