I’m doing abrsm piano grade 8 and I’m taking the exam next year, and I really want to learn guitar but my parents just won’t let me. They just want me to finish piano, and i really want to have a guitar and learn guitar and stuff..
Why not both? If you can convince your parents to let you buy a guitar and a music book, you can keep up with your piano lessons and teach yourself guitar. Luckily, it is one of the few instruments that is fairly easy to learn on your own. Once you understand the basics, you can do a Google search for the chords for songs you like.