Then this is where I'd start. You can't hide behind fear. You need to break through it.

Try and set daily goals where you're putting yourself out of your comfort zone and contact "someone". It could be an over-the-phone hotline for support. It could be making small talk with a cashier at a grocery store. It could be booking a virtual doctor's appointment (or physical if your country allows it). It could be reaching out to someone you trust for a small chit-chat.. a neighbour? Talk about the pandemic.. easy conversation to maintain.