I'm depressed and friendless what do I do?

I'm as shy as they come, I'm terrified to even talk to people and when I do my voice deepens and I get short of breath because I get nervous and I seem weird because of it. I hear girls whispering about how hot and cute I am And I know Many girls find me attractive I cannot get myself to talk to anybody And I often sit alone at lunch wishing to be at home. I just moved to this new high school about a month ago. I am not confident at all and sit and belittle myself. I have become depressed and upset with life. What do I do?