Does anyone else with PTSD do this?

I have this thing where I go on autopilot and I feel like I'm not in control of myself. I just do what I think other people are expecting me to do, almost like their imagination is controlling me. Even if I don't think something is a good idea, I still do it if I think people are expecting it of me. Sometimes I worry that I'll hurt someone just because they perceive me as a threat and I react that way.