sometimes men have some semen discharge overnight, especially when they are not engaged in sexual activity. if there are other symptoms, see a doctor. it could be an infection, but not necessarily an std.
If its a white or clear, somewhat sticky discharge, and its only in the morning, it is totally normal.
If you have no other symptoms, like burning when you urinate, pain, etc., then I wouldn't worry at all.
Also, if you haven't ever had sex, you can't have an std.
Aj