Do not dwell on what you do not have, do not look at what you are missing, do not stay hung up on what you lost, do not get stuck in the past that you cannot move forward, the thing is with getting stuck in the past, it is not just a metaphorical cliche, it is true, you keep wasting all your thoughts on what used to be and what could have been and you forget what you can be, and time goes by, and those who love you try to please you and you are never satisfied, you are just stuck. You are stuck and your energy every day is being wasted being stuck, not in today but in yesterday, and that is the easiest way to burn your life away.
The past cannot be your trap, whatever it is it will make you stronger, because if it was meant to kill you, then you should have been dead by now, you would not be idle. No one is meant to be idle, we all need to put our 110% in everything, lift up our spirit, and smile even if we are hurting, because when we smile it makes us feel better, it is like a comforting pat on our shoulder.
No matter how painful what you are missing is or how heavy it is on your heart, you need to push through it, step by step little by little, because everyone is distend for great things, you can be a super mom/dad, the next Bill Gates/Steve Jobs/Mark Zuckerburg, the top of the top in anything you want, just do not get stuck, do not be the person that gets no where because you cannot leave the past behind.
Comfort yourself if you need to, grieve if you need to but do so when you are moving forward, otherwise you are just self destructing, and it is no ones loss but yours. Take it from someone who is 22 and for the longest time has felt that her life ended because she was too stubborn to appreciate all the good she has now because she would not let go of what she used to be. Endorse your new circumstances with acceptance and hope in order to achieve the greatness that you know you can reach!