My problem. At all please help me.

Sometimes when Im alone or even in a crowded place I suddenly get the feeling that nothing matters to me anymore everything seems useless everything seems so bad so wrong and sometimes I don't even know who to trust sometimes I wish I was death sometimes I wish I could turn back time and change everything some I don't even want to get out of bed or even talk to anyone I was want to stay alone and sleep cause sometimes I don't feel a thing anymore sometimes I really want to cry so bad but still I can't cry it's like Im smiling outside but inside Im dying everyday every second of my life and sometimes it hurts so bad that I can't even breath I feel like something is stuck down my chest and that I need to let it out but I don't know how sometimes I cry myself to sleep sometimes I can't even sleep sometimes I hate looking at myself sometimes I don't know who I am anymore it seems like my life is nothing at all Please help me.