Hmm... yes and no. The vast majority of the time I've never been afraid to make a post here. If I decide I want to make a post or thread, I make it. If I decide I want to share something or make an opinion, I will. There are very, very few times I've turned back from making a post once I've decided to make it.
Where I do become afraid is the reaction after I've made the post, and how people react if they felt a post or thread I made was 'stupid' or caused a drama. I do watch my step a little from brasher, more cocky posters as a result, because that's exactly what someone with my personality is going to clash with and exactly what is polar opposite to me. But it very rarely stops me posting what I decide to post, not on WrongPlanet anyway, after all I never know if they'll respond or not or who will respond.
I have however become afraid of making posts at all on the love-shy forum where I used to post. I do still visit it regularly, but only ever to lurk, as I'm extremely interested in the subject. I stopped actually participating there because it's just a very rough forum, where ad hominem personal attacks are common and not controlled. It's not a place for sensitive people. I think in this case I became afraid of participation in the forum as a whole due to the amount of personal abuse in the forum generally, but you inevitably get some of that abuse if you post enough, and I was hounded and followed around by a particular member an awful lot.
Another one is the City Data forum. That too is one minefield of a place. I made one post there in months, because I felt I had a definite opinion on something and felt I knew the answer to it, and up flew the fists straight away. Wow. But it does seem to be very easy for me to spark off a drama on forums inadvertently. Theory of mind.
It's a shame I refrain from participation on forums about subjects I'm really into, due to the level of psychodrama there. But I guess you could say that because I've ended up traumatised over and over again in my life, I'm nowadays trying to find and close the loopholes by which psychodrama and trauma can get into my life. Forums seem to be one of them.