In general, it is believed that the past, present and future exist simultaneously. We simply move on this scale from the past to the future. This is a general way, and there are exceptions.
To change your past, you need to change your attitude towards it. First of all, you need to learn to forgive all our offenders. This way you save yourself from the inner gravity of your bad deeds and the future will change for the better.
We need to love ourselves in terms of the fact that our body is our temporary dwelling for our soul and, as in every dwelling, it is necessary to maintain physical and spiritual purity. Love yourself, do not be confused because of narcissism, which is a great lack of personality.