I think that the common ground we ( include yourself too )share here is the starting point to finding more common areas (and differences) with the others that inhabit this space. To me, that process of discovery allows me to "know" everyone else here, (to the extent that I can know anyone anonymously) and be able to ask for and give help or advice, where needed or asked for, on topic or off.
In the anonymity of the site, sharing life stories and events that shape who you have become, trust is less of an issue, I think. Generally, there is a shared trust we have with other members because of the sensitive feelings attached to why we are here, otherwise we wouldn't bare our souls (or at least give details that show how we arrive at a certain point of view about things) and be able to give and ask for help dealing with issues beyond the physical.
The "people you can't trust who will only criticize" are real, or on the site?
If they are real, and you don't think they can be trusted with what you want to talk about, then you need to find A)someone you DO trust IRL if it is a big thing, and B) look here.