is it normal for a 13 year old male does not pull back the skin covering his nob

hi my name is john and i am 13 years old i am a male and i want to no is it normal to not masterbate and is it normale for my skine to cover my nob and i cant pull it back because my penis is to big and i am a scared that my skin might ripe if i pull at it and is thise all normal plz help me i realy need some help  will thise reck my sex live when i get older like will i be abel to have a child plz help because i really upset my father does not live whit me so i cant ask him