No, you're not "more educated than most adults" just because you watch Time Warp Trio, Tutenstein, History's Mysteries, Ancient Almanac, Naked Archaeologist, Mythbusters, etc. You know a lot about history, and you like learning, and that's great! But you don't know how the world works. You don't know how the government works, or how to do algebra, or anything about many foreign cultures. You'll learn more by not being an asshole than you will by watching the same 30-minute TV shows 20 times. (Oh, and do you know what the Holy Roman Empire is? The bakumatsu? The Cuban missile crisis? Yeah, I didn't think so. Please study something other than the ancient Middle East and Mediterranean sometimes.)
Refusing to use slang, emoticons, etc. also doesn't make you smart, and putting other people down especially doesn't make you smart. It just makes you a dick.
It's ok to like girly things. It's ok to wear clothes other than sweatpants and t-shirts. You don't have to prove anything to anyone. I know you think you have to assert your dominance over boys by knowing more about Star Wars than they do, but honestly, the idea that "other girls" are stupid, that girly interests make you stupid, etc. is more sexist than any doubts your average 10-year-old homeschooler is going to have about whether or not you know how Chewbacca dies.
On that note, I have good news and bad news! The good news is Star Wars 7/8/9 is not just an unattainable fantasy, and will happen much sooner than you think it will. The bad news is it's nothing like what you expect. Don't get too attached to the EU, especially not the Skywalker/Solo family, because they're going bye-bye. Oh, and Avatar and Teen Titans will also get sequels of some manner or another. Don't bother with those either. The future is full of disappointing franchise revivals, kid. But the good news is that the live action Fullmetal Alchemist is great! (Bad news is that Rie Kugimiya isn't in it and it doesn't feature any music by l'Arc~en~Ciel, but you know, it's equivalent exchange.)
Yugioh isn't just edgy rich boy Pokemon, it's actually pretty cool. It's about friendship and ancient Egyptian ghosts. Stop refusing to watch it. Wyd
Grades on assignment are not the same as your overall grade in a course. "Straight As" does not refer to assignment scores, nor do you need straight As to get into college. Getting a B on a math test does not mean you're doomed to be homeless.
Everyone who does something starts out as a beginner at some point. Nobody is born with amazing innate knowledge of anything, so don't hold yourself back from trying new things just because you feel like you need to already know how to do something in order to do it. You don't need to be an Author™ as a career in order to write, you don't need to have an in-depth knowledge of anatomy to draw, you don't need to be Marie Antoinette's tailor in order to sew. (By the way, sewing machines aren't that scary, you just need to not make it go 500 MPH and then you'll be able to actually sew straight lines.)
Yes, there is such a thing as Thursday in Japan. Please don't blindly accept everything you read in the comments section of YouTube.