Why does my mum not want me to have a serious relationship or marry?

My mum is not religious. Schizophrenia runs in the family on one side. Both my younger cousin and I have it mildly. Both sides of the family are very supportive of both of us, supporting us at home and with our educations to find work. However, I’ve noticed that while it’s subtle, my parents seem less supportive of the thought of my having a serious relationship since I was diagnosed; and they claim that I am more ambitious and intelligent than my cousin. I’m also older and I’ve had a responsible job as a carer and now I’m studying to work with disabled kids. I’ve proved that I’m capable of holding down a responsible job working as a carer for 3 years where I had to basically be my own manager and write case notes, for people with disabilities, mental illnesses and the elderly, which wasn’t my role because management were so negligent. I’ve recently proven that I can manage without my pension if I want to and work full time, by doing it twice on work placements without symptoms.

I have the impression that from what people are saying, she’s less intelligent and ambitious and less likely to move out, yet I’m the one whose mum doesn’t want to hear her focusing too much on something serious with a man. Why is that, when I’m doing better? Why am I being treated like I’m less capable when I am milder, older and more capable?
Why does my mum not want me to have a serious relationship or marry?
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