Fear of Getting Close to Others

Do you ever feel scared of getting close to anyone, whether it's family, friends, new people, or even pets? I always seem to have this invisible wall up. Whenever I start to feel attached to someone, my mind races with all these "what ifs." What if something bad happens? What if they die or leave or just lose interest in me? Seeing others go through tough times makes it even harder. So, I end up keeping my distance. I still interact, but I never let it get deep enough to form real, meaningful connections.