"How do I live?"

Lately, I've been thinking about my life, am I really living it? I ask myself, "How do I live?" I don't even feel like I'm actually here sometimes. It seems like I'm standing still while everyone around me is moving on. I feel like I'm being left behind. The world seems to have forgotten about me...what did I do to deserve being left behind? Is there something that is inherently wrong with me? I don't expect anyone to read this or respond, after all the I seem to have been left behind.