My grandfather died in the 80s, 20 years later my grandma got a boyfriend, a widower similar to her age, so both in their mid 70s. She once said that she thought she would be alone for the rest of her life and never thought she would be so in love again.
They never married but had 15 beautiful years with each other. What I'm saying is that it's never too late to find happiness, no matter what that might entail.
I think you're wrong, I am sure that there is someone out there for you and I am sure that it will be unexpected and strange and different than you imagined in ways you can't even think of today but it will happen. Just be careful not to reject it because you were conditioned by yourself and others to not believe it.
I hope you have a great weekend <3