How can I recover my private life after I shared it with the wrong people?

I made this mistake of opening up about my inner world, my dreams, my most cherished things, with people at work and flatmates who trashed it all, gossiped it, ridiculed it, and some were even abusive. Now I feel that I don't have an inner world anymore and that I cannot live and be myself because everything has been exposed, soiled, tainted. I'm afraid that this is the rest of my life. It doesn't matter if from now on I say nothing to anyone, the damage is done. For me the whole concept of exposure is bad in itself, I'm a kind of very introverted and very reserved person. I absolutely do not want to throw away my whole life and "start liking" other things when everything that matters to me and is me has being destroyed so much. What can I do?