My Wooden Casket With Strings

One might call it a 'guitar', But, sadly, I have to call it my wooden casket with strings, No offence to the instrument, Its not that bad of one really, It's just something with me, A personal grudge, I have been playing it for more than 3 years now, I am not great at it, HECK I am not even good at it! I have an older brother, also plays guitar, Better than me in every way possible, Because he enjoys it, I don't! A twin sister, a better pianist and singer, Only because she enjoys it, I don't! My family hired a guitar teacher, recently And now it is too much work! I used to love music, Before being given this casket I hate to play! I am just in 7th grade, but this thing comes and ruins my day! Well, for now, I have this machine of doom, My only wooden casket with some strings