i mostly taught myself, i got good by buying some really light strings and learning a bunch of weird sonic youth tunings and songs. after doing weird shit for 4 months and playing guitar with screwdrivers, i bought the heaviest strings i could find and found that i could play better in normal tuning than i could before. some suggested tunings are GGDDEbEb, ACCGG#C, F#F#F#GAA, and AAEEAA. make sure that the doubled strings are at least a quarter tone apart.
I am in grade 11 now, and I've been playing guitar since the beginning of grade 7. I've taken lessons since the very start and I am now taking classical lessons. I wanna go to Musician's Institute in Hollywood after high school and get a bachelor's degree in guitar! It's gonna take some work though!