Alone

How can I have so many people around me and still feel like I'm all alone in the world? I have so many people that care about me....my family, my friends, and a loving boyfriend....So why do I feel like I have no one? I feel like no one understands me and that I have no one that I can talk to....but theirs so many willing to listen. Why do I feel this way? Sometimes at night I lay in my bed just thinking....Would anyone care if I got hurt badly or even die? Would anyone even cry or shed one tear? I always ask myself if anyone cares for me when I already know the answer....Yes they do care. So why do I ask myself that question? Something in me always says....They don't care, I'm alone, I'm worthless. I have everything I the world that can ever make me happy....family, friends, and my boyfriend....So why am I not happy? Am I crazy for feeling this way? Am I the only one that has these feelings? Does anyone have the answers?