Nobody wants to hear you post negative topics anymore?
Life isn't all roses, no one on here expects positive only posts.
Life has challenges.
It's ok to post about what those challenges are.
It's also ok to post about what you want to do about them if you know that.
You won't get better if something is bohtering you and you want to express it but don't.
It's good you have made attempts to be more social.
Ditch the flakers, your gut instinct will tell you who you can trust and who will treat you right.
Having said that, from my experience, those who see vulnerabilities to abuse will sniff them out like a ratter, so if you can do something to mend the breaches in your electromagnetic field that people unconsciously sense, you will not attract abusive or flaky people.
Your intuition is a good way of sniffing out respectful people, so long as you show you respect yourself.
I think you joined the hiking group for the wrong reasons, if that was the only reason you joined.
Much better to join groups that have people who share your interests.
It's common to forget even what our interests are, I forgot that I liked art because I so badly wanted to be good at sport to fit in at school.
Many people have restrictive work schedules so that is where the internet comes in handy. Say you discover you like basket weaving for a daft example, you can then look out for groups online. The internet is full of people who share our strange interests.
Sorry to hear you now suffer from PTSD-like flashbacks.
Are you getting help with this?
There are online groups that are very supportive.
Look into Somatic Experiencing or Internal Family Systems, but be very careful with yourself and tell members you have PTSD, as you want to do these things gently.
You want something to go your way before the year ends.
Take the first steps, if you need any more support I am here to listen.
I have both a therapist and a therapy group.