SAD, OCD, DEPRESSION. Confusion in mind.

Being a shy boy I didn't speak in my school even after beating but i was among toppers. I did b tech from a college next to my house (as my parents especially my father was over protective but he died when i was in final year) in college i started only to reply with smallest sentences. Sometimes students made fun of me but i could not respond.Also i can't speak in presentation etc. So depression started.Then i did m tech in 2012 but jobless now since my eyes water while talking to people as if i was crying and also i can't greet people on meeting them. So now i don't come out of my house and hide when a guest comes due to guilt of not able to greet them and also to avoid questions of job & marriage.I also has OCD & always jealous of my younger brother enjoying life with his friends while I m continuously in tension.I get no respect in family/society & younger brother also insults me.I don't have a single person to share feelings with. I feel my life is ruined.Also hv confusion in mind.