when im with my girl, i can do smallest things like play footsie, and get an erection, plus maintain it for some time... its just when i get ready to have sex, thats when my buddy wants to play dead. now it does get a erection when im about to have sex, but i can not keep it for long.

can any one help me out here, i am so lost into what should i do

you are probabaly worrying about your performance too much, getting to the deed does not keep you focused on the actuality. Performance anxiety is a killer to a guys utensils. you just need to keep jerking it off before you enter her. that should by you enough time to get goin

Maybe your Peter does not want to be filed in her folder. Do you still find your girl attractive?
Sometimes people need to think of someone else to get going

Maybe you need more foreplay...sometimes the woman needs to do more than play footsie to get ya going.