I too have gone through a big change in my life starting bdsm. I was more scared about "everything else" than becoming masochistic.
I was the same way. Couldn't handle any pain and felt like i complained too much and that pain must hurt me more than it hurt anyone else. My first play date; my dom said he purposefully wanted to find the edges of my limits. He said he expected that it might not be that fun and that I would safeword frequently.
I ended up getting spanked, paddled, flogged and having my nipples pierced with needles all the while begging for more and not safewording and he didn't give it lol I was amazed but not scared. He explained to me that the ability to eroticise pain is a skill. One that some people instinctively know or find and that otherwise can be learned!!
I still would not say im a real masochist. In my "normal" life I am not wanting and needing the pain, i dont seek it. When play time comes around I positively vibrate with anticipation of it and I really enjoy it. If it happens fantastic. If not I might have moments of disappointment but only moments as im really enjoying everything else immensely regardless lol