It's difficult to say with any certainty but I think it could definitely be at least in part caused by your negative, abusive experiences with men, since those were basically the only romantic/sexual experiences you had and at a formative age. You could of course be ace but at the same time there's enough to support the idea that it's more likely a disinterest caused by a coping mechanism and trauma since your brain might very well associate romance, men and sexual interest with the negative feelings that resulted from those abusive encounters.

If that is the case, it's something you can probably work your way out of with therapy, support and a positive experience.