I dont understand why you think you've let yourself down? What happened?

Okay so it looks like you are very focused on the past. You must remember that the past only exists in your mind. You are recreating the past over and over the more you think about it. That is why you, and the people around you, cannot move past these past events. Once you are able to let go of the past, you will be able to move forward and create a new future for yourself.

Yes once you change your energy, their energy must change correspondingly. Once you forgive yourself and realize that the past doesnt exist, then it will cease to exist. Our mind is so powerful that if we imagine a past event, we are literally recreating it and attracting more circumstances(and people) to feel sadness, guilt, anger, etc. The great news is. we can also use our minds to create happy things. It's all about what you are focused on. So whenever you focus on a negative past, you are recreating the past and creating a negative future.

The past does not exist. Only the present moment exists. The past only exists inside your head and you have the power to control what goes on in your head!

The reason why the people around you change as well is because right now, you are bringing out the version of them that you think is correct. Humans are complex creatures and we are able to change based on our environment. For example, how you act around your friends is probably very different from how you act around your parents. That is because your friends bring out a certain version of you that your parents never see. So right now, you expect them to treat you the way you think you deserve to be treated. When your idea of what you deserve changes, so will they.