Do you know that being able to wake up every morning is a Blessing on is own? While the journey of others ended yesterday you are given another opportunity to do something with your life, appreciate that.
The way you decide to start your day determines how productive you will be throughout the day, so do not start your day by remembering the mistakes of yesterday but rather reflect on them and say "I move on to something new that comes with the new day".
Decide to be in a good mood, plan out your day and just enjoy it. It all starts with you!