Do trust issues tend be worse when they stem from family rather than relationships?

i would not say that this is anything to see a therapist about. Things that happen throughout childhood often have a large impact on people. You'll just have to come to the understanding that not everyone is untrustworthy. Perhaps start trusting people with small things that you know you won't mind if it leaked (just don't tell them that). If they keep these secrets, you can gradually grow. Don't really expect instant recovery.. Just take it slow and build up to trusting people, but you have to be able to lay the foundation.