Afraid of the truth, unsure for now....

I am a strong advocate of having protected sex and getting regular pap smears.  I'm young and I can admit to be sexually active (not sure that I'm proud of it but I've never been ashamed by it either).  I have a strange rule that I adopted about 3 years ago, I only have sex with men that I'm in a relationship with.  This after have a one night stand, and multiple sex partners for a few months.  Well, here I am now 6 years later with a sore in my vaginal area that resembles herpes.  My boyfriend and I have been together for almost 2 years and I've never cheated on him before.  I am so afraid and embarassed.  I told my boyfriend about the pain when it started and I've been keeping him posted on my appointments and doctor calls.  He took it upon himself to research the "sore" and he said it may be herpes.  Completely in shock, I refused to believe it.  Comparing my sores to images I found online, there is little doubt left in my mind.  Again, I'm scared and not sure of how to deal with this.  Well, nothing has been medically confirmed.  I have an appointment tomorrow with a clinic and until then I think I'll sit around and cry and wonder why this is happening to me.