Although I wouldn't consider it my main reason for not wanting to parent, I'm happy to 'miss out' on pregnancy. I'm very hypoglycemic and have to eat frequently to prevent mood swings. I don't even want to think about how the pregnancy mood swings would affect my life -- I'd probably end up in jail. I also take very good care of my body and would be upset by the damage pregnancy would likely do to it. Everything's 'in it's place' and I can laugh/cough all I want without peeing my pants.
I feel the same as you. It is not my main reason, but I have a sensitive nature: my skin is allergic to the glue on Band-Aids and surgical tape, to Benzoid (which is that yellow stuff they prep you with when they cut you open to prevent infection before surgery); I severely react to anasthetics; am allergic to Penicillin, erythromycins, cephalosporin, etc.
I also suffer from mood swings
So the sensitivity thing also affects all my senses: smell, sight (light sensitive), sound (I hear silent alarms in jewellry stores, for example), etc. So the shrill screams of children, REALLY get to me.
I also have trouble sleeping, and if I don't get my eight hours, I have trouble concentrating and have little patience.
So imagine how I would be with a baby and children? Am I a good candidate for child-bearing/motherhood? LOL