Oh dear, I'm sorry to read you are having a tough time. That is horrible of your co-worker and horrible that others would do the same.

I'm not sure what you can do about it other than observe those you see as being successful around you. I think though I have recommended that already. How did it work out?

Is there a support group to go to? I've met people at mine. It is good to spend a few hours a week with understanding and like minded people.

Is there anywhere you can volunteer? I've met some nice people who share my interests. Several of them and I occasionally grab a coffee together. As bonus, I really feel good because of the contribution I make.

I've even struck up conversations with people I see regularly - like a cashier at my grocery store, my favourite barista, and chap I often see on the bus. I've also made acquaintances with the people I sit alongside to at the sporting events I go to. These people may not be friends but it makes me feel good to share a few words with people who recognise me.

Perhaps these might be viable starts?