I enjoy these threads, I think that when everyone bangs on with frivolous chatter, it's good to talk about topics that orbit around our most primal urges. Discussing sexuality in a civil way is something that a lot of people tend to avoid, because it has become so taboo that the average person tries to avoid thinking about it.
However, on the complete opposite side of the spectrum, pondering about sexuality may be behaviour caused by a degree of confusion, since people aren't exatly fond of discussing this kind of thing, a person who just has a problem finding his or her identity (Which is something that happens to all of us in at least one area in life) is left completely unguided to figure it out alone, and might interpret these perfectly normal things as something bigger, and I guess that's where the Internet comes in (Or college advisors, I suppose)
To answer your question; no, I'm not particularly insecure about my sexuality, but neither do I find it repulsive for a teenage to be. I do believe, however, that an adult showing signs of sexual insecurity might be only the tip of the iceberg for a long going history of repression.