What are the possible ways you could have obtained an std when you have never had sex before?

No STD w/o contact: You must have some sort of sexual contact to pass an std from one person to another. This does not only mean vaginal intercourse though. Some STDs are passed by transmitting fluid from one to another. Others are passed by skin to skin contact. Penile, vaginal, anal, oral or even touching the genitals is required to pass an std.

Non-coital ways: Non-sexual or non-coital transmission of microbes (viruses, bacterias...) can occur from mother to fetus or baby; from blood transfusions; from contaminated instruments; from needle-sharing...