Whenever I tried to forget my past

Whenever I tried to forget my past life.... there are some bunch of friends remembers me the things and hurt me a lot. Already most of my friends left me  because of my fault. I know what I did. I regret it. I am not anymore like before. But they still point the things out and hurting me... Why?? Why?? Is there no second chance for me?? I am completely started hate to live... I am really felt alone. There is no one for me..