I know EXACTLY what you mean. I have been going through this for years. It's ridiculous. Like, high school is over, you know? I graduated 6 years ago, and why am I still dealing with this?
On the upside, it has given me the opportunity to rethink which relationships are "healthy" for me to have, both spiritually and mentally. It's also given me a great opportunity to branch out, and I've gained a few unexpected friends that way.

Like I said, I totally know what you mean, and the level of annoyance you're experiencing. But maybe something good will come out of the frustration....maybe you'll meet some new people, or have other unexpected things come up that are positive. Keep smiling. :)