Basically, they're scared. They don't dare to show it out to others about how they really feel. I myself was depressed. I pushed them away because I knew that nobody liked negativity, and it's always this negativity that is the origin of all the problems that comes with it. We're scared of showing others the true and raw self, the side that we have kept for who knew how long. If we don't push them away, we feel exposed. And a lot of times, the loved ones just can't understand what we are thinking, giving (let's just be honest) useless innocent advises, wishing that we'd just suddenly go back to being happy. A lot of times, they just don't understand how depression really is like. Many thinks that it can just go away suddenly like having a cold. And it often frustrates them when they realize that they're of no help for you as you're fighting against such a tough war. For us depressed people, we will then feel bad that we're passing this negativity to others, "destroying" the innocence and purity. It makes us feel bad that we're the ones being different. Looking at others who are able to just love so easily, it makes us feel that we're different, more like weird. We see a border separating us and the loved ones, where we both live very different lives, think very different things, and has very different personalities. We push loved ones away, because we don't want to see any of these happening. We're just trying to prevent anything worse to happen, although sometimes, by doing this, we're just making it worse.