OP, you might not be in a mood to appreciate humour, but I read the title of your post and assumed you were married! 😂😋
In all seriousness, I hope you find a relationship that can meet your needs properly in future BUT it is always a good thing to know how to cope without a significant other. You might not be happy , but try and spot the points of the day when you aren't actively thinking about it, and when you feel more content than the rest of the time. What are you doing at those points in time? (Let's hope it is something sensible, not getting plastered bingeing on a bottle of wine).
Loneliness is a horrible feeling. Everyone recommends volunteering, to help with it - is that practical for you? Maybe you could be a phone companion to someone else who is isolated, if you can't get out.
I'm definitely better when I've been put in fresh air, and for me it is gardening, cycling, walking that gives me peace of mind.
You will always be more successful on a relationship, in my opinion, knowing how to be self-reliant emotionally. It is fine to enter a deep and intimate relationship, and let go of some of that self reliance, but being very needy especially early on, isnt always a particularly great start for a secure relationship.
So ... plenty of time to practise now and become content and self-contained. It will take the pressure off future relationships to fill that empty space for you, and that might actually give those relationships a better chance of success.
I hope this doesnt sound really harsh, hope in some ways it gives you a bit of food for thought that although your situation is a bit rubbish, you are probably able to learn something really useful about yourself if you reflect and work on it.