Firstly, there is no wrong way to be human!
Secondly, pleasure is something that happens in the mind, not in the body. If you prefer and enjoy being used mercilessly, then by definition that is what gives you pleasure... even if the sensation of it is one we ordinarily would call pain. As anyone who enjoys S/M play will be happy to tell you (that's not me, but I have very close friends who do).
Whether that means you are "damaged" is a different question - obviously the "pain" sensation evolved to help us learn what to avoid (hot stoves are the classic example), but human beings are proficient at learning alternate interpretations for sensations. Bitterness is a great example - it means what you're eating is likely to contain toxins. But some people seek out bitter foods, or enjoy it in combination with other flavors - and that is learned behavior (children rarely do this). So I would only say you're "damaged" if that association is maladaptive for you or causes you psychological problems. And IMO you are one of the sanest people on this site, so I'd say nope, you're not damaged!