Nor is it formal.
If the forums are a 'formal' setting, then you would use watashi.
That's too formal.
If this is a class in school, you've had 4.5-5 months to learn it.
Unless you've skipped 95% of your Japanese classes, there is no reason to be at the level of fluency that you are at now.
You're assuming class dynamics that aren't there. We didn't even start learning Kanji until like a week ago when we learned stroke order and such for the days of the week. All classes since the first week have been on increasing our vocabulary to plug into a formulaic sentence structure. I'm not behind the rest of my class at all. You're a cigarette for trying to blame me for not knowing things we haven't learned.
Also, before you bring up me spelling wa as wa instead of ha, I never, EVER, type in Japanese on the computer. He made sure we knew how then never had us do anything with it.
"The entire culture is forgeted because some people like Hatsune Miku."
Sure sounds like stereotyping to me.
More like, "The entire culture is forgeted because Hatsune Miku is an extremely popular musical artist there."
It's not like Hatsune Miku is just some name a few people have heard of, she's an extremely famous idol and artist. And don't limit yourself to the word like. People are obsessed with her.