So you basically cover a ton of songs without knowing how to play any sort of music. You have a condition known as tone deafness. Tone deafness is a big challenge to overcome, but it can be done. The first step is realizing that you are IN FACT tone deaf. This means you cannot correctly discern intervals (or the distance between) musical notes, therefore cannot tell if you are singing the correct note or note. Hence you cannot tune your guitar by ear or sing correctly. - ShanghaitunnelsHe's referring to The PFYFH.