Yeah, I have trust issues and people do teach you whether or not to trust them. There's not so many people (in my experience) that are actually good to their word. I find that REALLY frustrating...why say it, if you don't mean it
I think, do not blindly trust, reserve it with your judgement until you know someone. Therapy is helping, cause I was/am prejudging and distrustful because of bad experiences. Even things that I like about people were setting off alarm bells.
I thought I was pretty open in therapy, but was actually kind of telling stories I'd told myself a million times, and avoiding the really triggering stuff. My therapist is really good at checking in, and pays a lot of attention to little things. It's really helping because I had no idea how many things were triggering my defensiveness.