Trust is a basic property of the human psyche, which lies in our ability to feel safe in interactions with other people.
This is very important in close communication with a person; without trust, we cannot win the person over.
Try to build trust gradually, starting with small steps. This could be trusting people you know about small things, and then expanding the boundaries of trust over time.
Try to notice the moments when you feel mistrust and think about the reasons for such feelings. Your past may have had this effect, but it's never too late to fix everything!

Negative experiences in the past hurt a lot and change a person. But we must remember that this will not always be the case. And you need to continue to live, trusting people and events. Without trust it is very difficult.

The first step to regaining trust is to teach yourself to communicate openly with others, express your feelings, thoughts and fears, and listen to others.
Discuss your feelings with a loved one, and say everything directly.
Talk to yourself, and find out deeper the reasons for your mistrust, and make a choice on how to work with this problem.

Do you have problems trusting people? Men, do you trust the girls on this site?
And how have you worked to regain your trust in this world?