Are these feelings normal?

Have you ever been completely surrounded by people that care about you and yet you feel completely alone? Have you ever felt that way everyday? It sucks... It makes you feel like your nothing at all sometimes. Like you have nothing to live for and yet you just keep thinking... Tomorrow will be better, tomorrow will be a good day. And then when tomorrow comes you think the same thing again. There are good days when you don't even think about it. And you have good days without feeling like you're nothing. You hate the feeling of being completely invisible to everyone, like if you say something no one can hear you. You scream and yet no one hears you. They don't even look in your direction. I don't know if me felling like this is normal....