too attached

I'm always unable to convey what my truest feelings are... I really envy them, those who can freely and easily say what they want to say. I'm not really sure whats wrong with me, but I guess I'm afraid, afraid that they might walk away, that even by putting so much into someone doesn't guarantee that they're staying, cause well you walked away as well, didn't you, so I have this circle, a circle around me that prevents anyone from coming near me, it's something that I had subconsciously created in order to protect myself. Close proximity aren't allowed in this circle, cause once I get too attached I get too attached.