Forgiveness of the past

In my life knowingly & unknowingly I have committed many sins, mistakes & crimes. But now I become very sad when I think about it. The past memories keep coming to my mind again & again so intensely that I feel like committing suicide. I can’t concentrate on anything else. Again & again I think about suicide as my past keep pursuing me continuously.

Do I have right to live more with happiness? Can my bad past be forgotten? Will god forgive me for all my sins & let me live my remaining life? Please help me. I am eagerly waiting for your reply.