I can relate. Anyone who knows me in the physical universe--that is, not digital--recognizes that I am very introverted. I'm comfortable with my family and that's about it. However, one thing stands out in your blog: you are sensitive to what people are thinking about you. Don't worry about that. I've been on earth for 77 years and I've learned that people don't care. People are too involved with their own lives to care about you. That sounds dreadful, but it's really reassuring. If someone seems to throw you a nasty look, they probably have indigestion or have just had a fight with someone.
Most people are remarkably self centered. That's a good thing.
@nkemakonam89 is absolutely right. The only way to break out of your shell is to go out and start accustoming yourself to the presence of others. As she says,
it's good to leave that zone and mingle more
Believe me, I know how hard it is. But, the more you protect yourself from exposure, the harder exposure will be. I'm wishing you good luck on this journey. Life is an adventure and you are entitled to experience all of it.
The process of breaking out as you noted is hard. And yes people don't care, but those indigestion or fight can be redirected towards me.