I feel empty and alone. I literally only have one person in my life, but I don't feel connected to him or like he understands me. If I express any emotion that isn't positive, he has a go at me. 
I've struggled with mental health for years and been diagnosed with various things in the past, but he either says there's "nothing wrong with me" or that mental health problems "don't exist" and tells me things like "you just need to cheer up", "happiness is a choice" etc. It's really unhelpful and it's obvious he can't relate. There is no one who understands me and I feel so alone. Sometimes, he will see me looking sad and ask me if I am ok, but it always seems like a trick question, because if I don't say yes, he will have a go at me. He guilt trips me for being sad because my sadness makes him sad, so my "choice to be sad" is me "punishing" him. Literally every time, he manages to twist the situation to make it all about him and how he's the victim and there's never any room left for me to feel or express anything, so I just resort to lying and saying I'm fine because I don't want the whole lecture that comes if I say I'm not. 
If I try to open up and tell him I feel lonely, then he takes it personally and thinks I am saying he is inadequate and I'm ungrateful for having him and I'm a horrible person. But he has friends and family and gets to go to work around people all day. I am isolated. I don't have anyone or anywhere to go. I have no place in the world. I'm lost and alone. 
I don't enjoy life. I spend most of my days crying on my own. I try to fill my time with hobbies, but they are just distractions and it often feels pointless to bother doing anything. Nothing feels fulfilling. I feel empty. Social groups have never got me anywhere. I don't have social skills despite all my best efforts to learn, I can hardly communicate verbally. I am told that people apparently like me, and miss me, but the feeling is never mutual, which makes me feel like I'm a horrible person. I don't feel connected to anyone or like I gain anything from interaction with them. It feels empty and pointless. I feel lonely around people, sometimes more than just being on my own.
Life feels like so much effort for no reward. I feel like I will always feel alone, no matter what I do. That life will never feel worth living. Sometimes I feel like it would be better if I just disappeared.