I have a feeling you're not Asexual because I think your dislike of sex comes from physical discomfort and possibly some psychological factors, since you mentioned SA at an early age. I'm sorry you endured this trauma. Do you have trouble with penetration? Sorry for the personal question, but there's a condition called 'vaginismus'. There's treatment for this condition, although not for everyone. I think once you find the exact reason and solution for the pain, you'll begin to enjoy sex. Its natural if sex brings pain, you'll lose desire or not have any.

You mentioned orgasm and not experiencing one. Another personal question - have you had any luck with self pleasuring? Its perfectly normal for you to explore your own pleasure. Here's a link for vaginismus:

http://www.vaginismus.com/vaginismus-symptoms