There is nothing unhealthy about enjoying pain, and to what level it shouldn't matter what anyone else thinks because it is what you enjoy or even love for that matter. Being more of a dom my perspective is a bit differnt though because I fantasize and enjoy snuff fantasies with hard core torture that nobody would really consider doing because its so far out there. I used to feel like I was "weird" an "outcast" and even labelled a "psycho" and I did the worst thing you could probably do and I denied myself who I really am by playing in ways I did not enjoy because I felt I had to to fit in with society and "normality"
I kept playing in ways I didn't enjoy for so long eventually I snapped and said "you know, I think that as long as I'm not actually snuffing people or torturing them beyond their limits and what is consensual between us whats weird about it? Its two people doing what they love and enjoy and gets them off is weird then so is normal regular sex or any other way to have sex for that matter.