Why does it have to be hard almost all the time??

I’m a single male around my 40s and my father died 11 years ago. I live with my mother who is around her 70s, diagnosed with bipolar, OCD and anxiety disorders. She is using a dozen of medicine which I think takes a toll on her. She is hella angry in 10 days a month. Favorite activity: Arguing with and yelling at me. Totally behaving like an old trout. Whenever I met a girl and she learnt that I have a mother who needs a bit of care and patience, they vanished. Because they want the world revolve around them and their relatives, not mine. Looks like I’m doomed and I hate my life to a full extent for at least 10 years. No glimmer of hope.