How long does hiv survive outside the body? like a teaspoon of blood for example. i know its a short time but minutes? hours, days?

Very short time: Why do you ask? "A teaspoon of blood?" Where did you run into such a thing? Only you know what really happened, and especially, I'm concerned that you're doing needle drugs. This alone is a reason to get with your physician for help -- tell the truth and you may well save you life. If you have any reason to think you have contacted HIV, please get one of the new early-detection tests. Be brave.