I gave oral sex to a guy friend lastnight said he had no STD but today mouth is a little sore possible std? Or being paranoid?

I'd vote paranoid. But if you're asking, it means you're not sure about the std status (or honesty) of your sex partner. This is never good, especially if you feel the urge to have random sex! symptoms of std will not occur the next day, but if you were particularly, er, vigorous, you could simply be sore from all the exertion. Perhaps you need more practice on a safe monogamous partner. If symptoms persist see md!