Who are you having a hard time trusting? Is it a coworker, spouse, parent, sibling, child, customer, or vendor? How is it getting in your way? How can you make them more trustworthy?
Now change the focus. Instead of thinking about how someone else is untrustworthy, focus on why it might be hard to earn your trust. Take inventory of other current and past trust failures. You may find the trust issue has more to do with you and your unrealistic or inconsistent expectations than it does with others.
It’s much easier to change yourself than it is to change everyone around you. How can you be more reasonable and consistent in your expectations of a trusting relationship?