Trusting anyone is hard to do, when you've been abused and let down by so many people. But it is possible. Sadly, you have been in contact with several people who can't be trusted, but there are still a whole load of people around who can be trusted. There are a lot of good people on the world. Do you have any friends, or family members who have not treated you badly?
You have to be willing to take a chance and trust someone. I think most people get their fingers burnt, so to speak, at some point in their life, by trusting the wrong person. I'm not trying to compare that to the abuse you have suffered at all. But in order to trust again, you have to give someone the oportunity to show that they are trustworthy. It takes a lot of time, and patience on both parts, but to learn to trust again, you have to let someone into your life, and into your thoughts. You also need to take it one step at a time, and be very perceptive of the response you get. As an adult, and mother now, you have much more control over who you choose to let into your life. As a child, we don't have that choice; are parents are there, whether we like it or not. Choose your friends wisely, and take things slowly. That is the best way to build up trusting relationships.