The evaluation by a provider who has examined you is far more reliable than any guess than any online expert can judge. Your ObG undoubtedly is right; and anyway very few cases of genital warts, if any, are acquired by oral sex. Most likely you just have some normal anatomic variant.
I strongly suggest you speak with your provider about the new HPV vaccine (Gardasil). Since you haven't really begun your (truly) sexually active life, you can achieve maximum protection. Once you start having intercourse, you can assume you will be exposed to HPV, assuming you have sex with people who have had any past sex partners themselves. The vaccine will protect you against the two HPV types that cause almost all genital warts, as well as the 2 types that cause 70% of cervical cancer. Your medical insurance probably will cover it, but even if not, the investment (probably $500-600, including your provider's clinic and administration costs) would be well worth it.
Best wishes-- HHH, MD