1. I understand what it is like to construct a "safe" world. But I also hear a desire, a longing, to reconnect.
2. Coffee. Perhaps you could choose to start by just going to any coffee shop. Take a book w/ you, and just be in the presence of other people. I also understand that the smiles, laughter and happiness of the other people you might see could be mildly painful to your heart as you read and sip your coffee. But if you can accept that (a) the negative feelings will pass and (b) accept that feeling of loneliness is a "call and an invitation" to be outside ouf your home perhaps that might make it all more tolerable.
3. This is only a suggestion. More people have understood once I lessened my own labeling of my own self based on what happened to me.