What you have right now is the present. There is no more important time in your life then NOW.
Living in a past that cannot be changed, or dwelling in the future that is completely unknowable is robbing you from the present, where you are right now, and where you have the opportunity to do something great.
For sure learn from your mistakes of the past, and aspire to big goals in the future, but do not let them distract from you today. Today is yours to own and make with what you want. Live for today.