I think i have an std. how can i tell which specific std i have?

Testing: You can't tell, for rsure, without an exam and testing. Call your doc and set up an appointment asap.

Seek medical attention: Answer: i hate to break it to you, but there's no way for you to know if you have a sexually transmitted disease without going to your doctor and getting tested. Although with certain stds the symptoms are so recognizable that they can be diagnosed by eye, most std symptoms are so non-specific that it's impossible to diagnose what sexually transmitted disease is causing them.