I answer my door to strangers, and 9/10 times wish I hadn't! Always people selling stuff or trying to get me involved in a political campaign (not election related).
You can be aware of risks (eg. as posed by men) and still generally friendly and community minded. I am. It's about being aware of boundaries and firm about what you say "no" to - as PP mentioned women are so often socialised to do the opposite.
What I find really bizarre is the amount of posters who struggle with anxiety, and/or have a real "pull up the drawbridge" mentality, but still seem to have full lives, plenty of friends, partners/children. Like, how did you make/keep so many friends? Why are people still in touch if you never answer the phone or want to meet up? I've had to make a real effort to put myself out there and invest in friendships, battling anxiety, to make sure I don't end up totally isolated.
I actually know someone like this irl, and still can't work it out. Doesn't like to speak on the phone because of anxiety. At a social event (surrounded by good friends) saying she was struggling with social anxiety at that moment - which made no sense to me, if I'm feeling socially anxious I'm sure as hell too anxious to mention it and just trying to blend in and act normal! But she has plenty of friends, good, deep friendships, and an interesting career where she has to really put herself out there. (Having got to know her better, I'm sure it's not attention seeking, just it doesn't make sense how it works!)
Also, OP - a diagnosis of cPTSD and receiving therapy suggests you have had private treatment, or possibly are quite young and in a rare NHS area where trauma is taken seriously. I'm in my 30s and trauma meant being fobbed off, labelled BPD, attention seeking etc. A sadly common story, but explains why so many have had to manage things themselves.