19 years old and still no sex drive?

Its true. I am a nineteen year old male and while I find girls attractive, I have no desire to actually have sex. If that makes sense at all, if not let me explain: I have the desire to be with a girls intimately, but having sex, I could care less about. I would always pretend to have normal males thoughts around my friends because I was a little embarrassed about it. Now, recently it got to the point where I'm thinking something's not right I should desire this. So a few weeks ago I talked to my best friend about this in strict confidentiality among us and anyone else that may have to know. I told him I've never masturbated or ever wanted to and just the entire story. He asked me if I have ever had a wet dream and I said not that I can remember. He told me to try watching porn, if that would do anything. I did, and it neither discussed me nor turned me on. We then agreed that I needed to go the doctor. I scheduled an appt with our campus' clinic and told the doctor everything. She ordered a hormone level test even though this was my only sign of a low testosterone level. The results came back normal, completely normal. No sign of anything that would cause this. The doctor agreed that I was and had been finished with puberty for a good while. We're both sort of scratching our heads over this.