I can totally understand how you feel. It's easy for anyone to say "let go out of the past" or "forgive yourself" but it is hard when it comes to really doing it. Your logical mind tells you that you should not hold on to the past but yet subconsciously, you know that you are hanging on.
EFT is the tool that I use to help me negate the negative emotions that I feel regarding my past. The past is a fact, a reality that happened. I cannot change what I did but what I can change is the emotions that I feel towards my memories. Without applying EFT or doing other emotional healing work, telling me to "let go of the past" is pretty useless to me.
A good place to start is to go to Gary Craig's website at
EFT Provides Impressive Health and Emotional Freedom--New Discovery Often Works Where Nothing Else . He has a free ebook that you can download.
I also share my experiences with dealing with negative blocks, such as past traumas, on my blog (see signature below). I invite you to read my experiences with my own healing.
Take care,
Evelyn