I feel for you OP. I live alone too. I understand exactly how you feel and I'm pretty
at the idea you can just go to tesco and all will be well, let alone those pp saying how they'd positively enjoy it. I'd call it spiteful if I didn't think it was just ignorant.
So...
Longer term, you need to work out a way of being happy in your own company; and coping strategies for when that doesn't work as well as hoped. Otherwise you just spiral into feeling shit and even worse than you started out with.
If I am brutally honest, when I have found it hard lately, I have ended up pissing about on the internet, working, or I just go to bed. I have been in bed so early I can still hear children out playing! But so what? It's my bed and my life.
You also need to let yourself feel sad sometimes, if that is what you are feeling. Trying to block it won't magically stop you feeling it. Sometimes life really really sucks and you feel really really lonely. While its shit, it is ok to feel like that and it won't be forever.
Short term, you need to find something that completely takes over your brain - whether through the monotony of it; or because it is working so hard. Exercise is one thing - I focus on doing that for the whole time and then the bonus of endorphins too. I have also been writing little cards to people out of the blue, with a few haribo or other flat sweets in - doing that gives me pleasure to know they will get something lovely and focuses my mind too. You can buy postage online so all you need to do is then drop them in the postbox!
Courage OP. It may be hard now but you will get through this and you will be ok. Hopefully some of the ideas here will help you this weekend. 