I AM EXTREMELY UNLUCKY?

Slipped and cut your knee did you? Aah! One way of being lucky is realising that you ARE lucky! You've got both your legs (presumably - or you'd have told us that) Maybe if you opened your eyes you would see that you are in fact lucky (and you'd also see the gum that you might step on before it's too late). If the things you mentioned are the only "unlucky" things to happen to you then you are indeed a very lucky person.