To the OP, at some point you have to realize that you, and you alone, are responsible for your experience of reality. You will never be able to move forward until you do. I'm not talking about a person's "lot in life", but rather the way we choose to experience the world we interact with.
I remember a point much earlier in my life where I had the same feeling that I was sure I was going to be alone forever. No friends to hang out with. No girl. School, work and rented movies were all I had. So, when I read your post, I can identify. I understand the emotional agony. That trapped feeling. You can't find your way out.
I had drawn the conclusion that I wasn't someone people wanted to hang out with. Justified by the internal belief that "I'm just not a social person". Reinforced by people giving me the cold sholder sometimes. Self fulfilling because of the internal longing for companionship that breads a neediness vibe that sends people running for the hills.
I had similair beliefs, justifications, reinforcers, and self fulfilling actions with respect to women as well.
I was only able to start breaking this type of self reinforcing reasoning when I realized that I was the only person responsible for my experience of reality.
You could think of it as being responsible for your own thoughts.
I was responsible for my conclusion that poeple didn't want to hang out with me. So, I then had to ask myself, was there ever a time when someone enjoyed hanging out with me? The answer is yes. Was my conclusion then valid? No.
I then had to ask myself, if I hold on to the belief that "I'm just not a social persion", what will my life be like in 20-years? Wow. It'll probably suck that much more. What a wasted life. So, I must conclude that this belief does not serve my best interest.
But, because I was responsible for this belief, for this thought, I could work on changing it. In the end, if I hadn't realized that I was the only one responsible for this belief, I would have been powerless to it, a slave to it, and I couldn't have moved forward with life.