I am so sorry to hear that. I can understand why you have trust issues. Unfortunately, people do change as they get older. I am not friends with any of the people I went to high school with. We all just grew apart. It makes me very sad to see someone as young as you having these kinds of problems. I know it is easier said than done but, you really need to give new people in your life a chance to get to know you better. You can't keep dwelling in the past.
I have seen several people here reaching out to you, offering you friendship and love. But, you seem to be rejecting the idea of making friends here. I am not saying this to be mean, this is just what appears to be happening when I read all of your posts. Why won't you give anyone here a chance? You could be missing out on a life-long friendship.
I know I am old enough to be your mother but, if you need/want someone to chat with you can pm me. I have been abandoned by 'friends' in the past and I have also suffered from mild depression. I do have a very small amount of insight into how you are feeling. If you do not want to chat with me, I do understand. I only wanted you to know that I am here for you if you need a friend.