This is your life, and to a great extent you can choose how to live it.
When things get tough, you can choose to let them drag you down, or your can choose to fight your way out.
You can choose to be unhappy about the things that you don't have, or you can choose to be happy about the things that you do have.
The perspective that you put onto your life makes a great deal of difference to how you feel, what you can achieve.
If you choose to always to live a life of regret, anger and inaction, then that will stop you from being the best that you can.
But if you choose to live life with love, patience and persistence, then almost anything is possible.