Anxiety and depression. Me or guide me.

I have a problem that i cant talk to people, i can talk to few words with strangers, but if i know that person or the other person know me i cant talk...i get scared. These days its increasing a lot. I am afraid of the word teachers, i was afraid of my school teachers when i was in school. I thought it would subside when i grow up...but it grew a lot. Now i cant even talk to my seniors. And in my profession i need to talk. I tried my making myself i am ok, but everyday the fear is increasing. The people around me get distance from me after they know me, they tell me that i am full of negative vibes and even my family members are telling that i am not up to my age. Please i need help, i can't continue living a worthless life, everyday is hard for me. Plz, i need help, i want to change myself in good way. Please help me or guide me.