Pretty much the entirety of my 7th-8th grade years. In my 7th grade year, I started off as a whiny little wannabe-goth kid, and turned into an annoying weeaboo at the end of the year. After settling down over the summer and realizing I was an annoying little idiot, I went into my 8th grade year being pretty normal. However, I started going after this girl who I later found out actually liked me at the time, and completely blew it, so she ended up with a nasty D-bag bro.
Funnily enough, years later, I now despise nearly all the things I liked during my 7th grade year, and the girl from my 8th grade year despises me.