I struggle with the same thing, and it is very hard for me to trust people, because the people that I should have been able to trust most have betrayed me. One thing you must realize (and I am still learning) is that people will disappoint you, they will hurt, they will betray you, and no matter what you do it is going to happen. But while coming to this conclusion I realized that if I never open up, and trust people, I will be missing out on so much more. Believe, this change is not an overnight thing and you can not expect it to be. I have ruined many relationships because of my lack of trust and my unwillingness to be open, and that causes me so much pain. Love is a scary thing, but if you never make the choice to experience it, won't you regret it? The only thing I can say is to have prayer, and lay your heart bare before the Lord, because He is the ONLY one who is going to never hurt you or betray you. Just pray for God to give you the strength to jump in with both feet, because if you are afraid you will only regret it later in life. It is not an easy cycle to break, and one that I struggle with daily, so you are not alone. Just pray for God to help you, and maybe try to find someone whom you trust and have them give you some insight and advice as to how you can fix this in a way that best fits you. Because when I talk to the few people that I do trust they are able to help me see what I am doing that is damaging my relationships with other people. You will be in my prayers.