No, it isn't unattractive. If anyone says that it is, then that person in general is not someone that you want to be with in the first place. Some people, whether by their own choice or just have never been asked out, just don't date, but that doesn't make them any less attractive. I know plenty of people, male and female, who haven't dated, or even kissed anyone, even if people like them still.
nope i would find it the opposite actually. pretty attractive to stay pure that long. and impressive aswell, good job :) Some douche might find that like a challenge to "explore un-explored land", be aware.