Yes, I see that religious implications may be a problem when you are not a believer.
Religion beliefs may be a great help for people but only if you feel it.
In that case, if you don’t find very hard to communicate online with a therapist...I think in your case it would be worthy a try.

I understand you very well bc I have been also having all kinds of thoughts that invalidate me and I know you perceive them as very real. And yes, they can be responsible for your self-isolation. I did it. That’s why I stress you so much in finding someone you can work a therapy with.
For me, it meant a great difference to be able to go out of my isolation.

Meanwhile, as Mickey said, there are self help books, webs and all kind of stuff in the net.
For example, I have a book about social skills and there’s a whole chapter dedicated to testing intrusive or distorted thoughts. It’s in Spanish though. But, sure...there are many others out there, in English.
Then, there’s a technique that can help you, Mindfulness. It can help you to identify all those different thoughts you receive, label them and put them in their place.
There are many webs about mindfulness and there are podcasts too,
so you can begin with guided exercises of mindfulness.

It called me the attention something from your first post. Do you question yourself about whether people hate you or about dislike you? The first one it’s very hard with yourself. Too much.