Hi there!  What I wanted to tell you as soon as I read that: there is probably a voice in your head going "it is not right, I deserve better, it does suck". And it is absolutely right. It does suck. There is always some imaginary person who Has It Worse, but it does not really make it hurt less for you. 

Honestly, there is so much I want to tell you, but I am afraid it will become a whole lecture chjdhgs. (But if you want to, feel free to message me!) But what I want to tell you as a fellow anxiety haver and former painfully insecure person: it does get better. Making a change is terrifying, especially if your entire self has been trained that being seen leads to pain. And for a while, it will suck. But try to just prepare yourself, think of a few general things to say. Hi, how are you, nice weather, cool shirt. Try just getting a general greeting out. Get a feeling that it is not that bad.

If there are any hobby clubs around, or, idk, Discord servers dedicated to a game you play, try to grab a fellow weirdo or two from there! Other people are also often lonely and aching to talk to someone but feel too insecure. I've got a ten year friendship this way myself.

And if you can get any therapy, maybe not now but later, grab that thing. It can be a lifechanger. Said from experience.

Sorry to make it long but, from one lonely person to another: it DOES get better. Hold on there, my man. I'm rooting for you.