Why does my penis look like this?

ook so i am 14 and when i get an erection, my penis looks unnormal ,i was looking at a anatomy book and i sa how the penis worked and the penis in the book had been circumsised and it had a "mushroom" type look to it .......so i am 14 years old and my penis is 2 inches flaccid and 6 inches erect ...but the flaccid penis looks like an anteater's nose ......... and the erect penis has a shape of a .45 acp round . lol it looks like a bullet or ammunition round ..the hangun type .....while on the anatomy book both flaccid and erect penises had the same shapes. when i get an erection should i pull the skin back or leave it?? is this normal?? because im not circumsised.