Did you ever read Moby Dick? I always remember the first words were “Call me Ishmael”. But of course Herman Melville wasn't Ishmael. As with a novel, just because a song is written in the first person doesn't mean it's in any way autobiographical. As I remember, Freddie liked Star Wars a lot, and he actually wasn't very keen on riding his bicycle (if he even had one!) - he preferred being driven in a Rolls Royce! But he created a character in the song, and this character can say what he wants, and he can ride his bicycle where he likes!