I am too.
I've felt the same way for the past few years. I'm female, 27 years old, I still live with my parents, haven't been in a relationship, and I doubt there's anyone who can love me for me. I've been depressed/mentally ill since I was 12. I can't connect with people like I used to. I don't have much to say and can't carry on a conversation. I don't feel beautiful or attractive because no guys have ever asked me out.
When I think about my future now, I see me living with my parents until they kick me out, or until they die, or finally moving out on my own, working, but coming home to no one. I know it's hard not to think so negatively, but when you've been alone for so long, you feel like giving up on love.
So you're not the only person who fears dying alone. I really hope the both of us do find someone who can accept us and love us for who we are.