Change yourself but not get changed:
Don't change your self because someone doesn't like u change yourself only when u get realization of some fault be open to criticism but shove them off if your mind and heart find them wrong and unreasonable, always be your self as u have to be first honest with yourself
Don't listen to them who want u to change but don't tend to help/support u in the same don't listen to them who don't even try to understand you
Do listen to them who want to change for good and at the same time love and respect you with whatever flaws u have
Try to make your character flawless and sturdy always stand for what is righteous .
Do what u believe in not because someone has said so.
Past, present and future:
Past is past future can always be hopeful if u will do things which should be done in present. of course u don't have to build the roam in one day nor u can. just make your little effort honestly Despair will try to bring u down it always does but remember hope is shining brightly at the other end of this dark tunnel to guide u to the future which is good and flourishing . This notion stands strong no matter how past u came in ur life or how bad ur past was