Is it nomal to not be able 2 have sex

i am a 23 year old man and i have a tiny willy it is under 2 inc when hard i have never had any troble getting a gril into the bed room but when thay see my tiny manhood thay lauth at it so i went to pay 4 sex a few times and wenver i put my willy inside her it falls out of her and she has to hold it to make shure it stays in is it nomal