I found a used condom outside. i got mad and weared it now my question is that do i have to test for hiv . i think it was used atleast 3-4 days before?

No and yes: No worries about contracting the HIV infection from the condom. If the question is about getting the infection from the sexual contact that is still possible if the condom was damaged.

STDs: You are not at rid for HIV. But you are at risk for Gonorrhea, Chlamydia, and Syphilis.

Depends: Is it your old one or somebody else........If your own and you have the same partner who is trust worthy, you are OK.

Depends: If the condom had semen in it and it was deposited there very recently it is conceivable that HIV could survive inside it, but not highly likely. In any event, go and get tested and checked for other STDs at the same time. Better safe than sorry. Good luck.