The thoughts you are having are about being victimized, and my guess is that you feel this way with the three losses you have had recently. The work in front of you is to make some new friends. People we love and care about and feel safe with will constantly move in — and out — of our lives. As difficult as it seems I would try to build on the relationships you have and add to them.
Trust takes time, but it also takes some effort on your part. Reach out and build more of a relationship with the people you know and look for opportunities to widen that circle of friends.