Can I overcome my shyness?

Hi!
I need help about overcoming my shyness and my anti-social nature.
I am the youngest one in my family. I am never been allowed to take part in group discusssions and i think that made me a good listener. but now, i feel that I am losing confidence while sitting in a group because i cannot be a conversation starter and even cannot tell my point of view to others.
What I think remains in my mind and I can't utter a word except a few words. I am really worried and disturbed due to this situation now a days.