Mom doesn't understand why I want bio children

So I'm 35 almost 36.   I never date (not by choice, it's by restrictions-not an lot of options for  me).   I also live with my parents due to Disability income.    The majority of my school mates have all have children.    I kind of feel well left out of having that incredible experience outside of life-sims games which isn't the same when that is only 3 day pregnancy.    I have always wanted to have biological children.   

More so after my parents (or in one case my late grandpa) have told me stories about our ancestors (Loyalists, fight against Irish Feanines, Mayflower,  ancestor going to England with William I from Normandy) .or stories like Uncle Frank who worked for Walt Disney,  or someone else spending time with Timothy Eaton.   I want to tell my children and grandchild those stories.  I want to see my children play with my old toys which I played with growing up.   Mostly' I guess it's because I want someone to look after me when I was old like grandpa because being the youngest of the cousins on both sides, I'm presumably will die last.   I also want someone to take care of, because I'm tired of the one being taken care of. 

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 The problem is Mom doesn't understand why I want to have children when it would be difficult. But what isn't difficult in life?  Sure it means no more trips for me with my parents  and it might lead to more arguments with Dad and I.    

But it's hard for me to get pregnant when I have no partner,  I don't have any male friends who would be a sperm donor and being on Disability income and not having my own place makes Adoption and fostering out of the question.    Also I want to continue  my parents' bloodlines.   

 I can't easily sneak away to an medical appointment if I was to book a fertility specialist due to my issues, Mom would need to come to my medical appointments especially the first one to answer the doctor's question about my medical history (thyroid issues and gallbladder been taking out).   Like what could I do book an appointment for a Wed and then sneak there from church?  My parents will have a fit. 

I do know one problem is I would have to be closely monitor by the doctors, due to the fact I would have to stop birth control i take for Thyroid issues (hormones for me to have my periods).  I probably would be a bad parent.    

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But I'm getting more desperate the older I get about wanting to get pregnant and have a child  because the older I am the more complications there are even without my other issues.    

I just wish Mom could understand why I want to have children and soon.  I get really emotional when I think of this every time because time is kind of running out because in 9 years time I will be running "out" of being able to have children.