I can very much relate. Suffering can make one rather antisocial (not meaning sociopathy, particular expression, but just in that direction, can be borderline or SZ-like).

I can be/appear very unaffected, cold and feel frustration. What causes more frustration is that many people in reaction to that (or when I explain why I react like that) will try to "proof" to me how very much they suffer, like I didn't get what they were saying the first time. Some people try to "proof" (it's implicit, but still) that they are suffering and I am not, based on my cold/composed reaction to suffering, reasoning I can't suffer or have suffered.

It's very frustrating. Honestly, if there are people I hate (I don't generally hate, not believing in malicious intent, ever: it's part of my religion and my religion is delusional, very strong), it's those people.

I'm always very matter-of-fact if I'm asked about any schizomania symptoms/behaviour/feelings/urges, I never tell anyone anything about it for any other reason than to explain myself.

However, when people just explain their problems in a similar way or they don't realise they overreact (like with "pure" neuroticism), I can be warm and sympathetic enough. I am empathetic. Very much so.

Some people just have no idea how other people may suffer.

Edit:
Same with physical pain: I've experienced two of the more extreme forms of pain and self-harm.