not get attached so easily!

All my life I’ve been let down and hurt by people. So I have a hard time trusting, but I get so attached to people. For example my best friend hurt me really bad, and in a period of a couple weeks, I was so attached to her. Whenever I couldn’t go to her house because my parents said no, I would feel so upset and almost like my heart was trying to jump out of my chest. I don’t know if it’s anxiety but, I hate that feeling. And I’ve tried not getting attached to people but all that has done, was sabotage those relationships. I think I have a fear of being alone, an it’s like a cruel joke because….I try not to get so attached to people but it’s like my mind and my heart are enemies. I may love this person with my heart, but my mind is telling me not to open myself up for potential hurt. And I’m only 16, but sometimes I feel wiser beyond my years. I loved my grandfather and he hurt me, I loved an ex bf of mine and he abused me, I trusted a volunteer at my elementary school and he hurt me as well. It’s just so much, I feel so conflicted sometimes on how to feel about people.