One thing that has really helped me through the ups and downs of life is memorizing some verses that I quote to myself when I need it. Here are the ones that have really helped me:
For I know the plans I have for you declares the Lord, plans to prosper you and not to harm you, plans to give you a hope and a future.
What then shall we say in response to these things? If God is for us who can be against us?
I can do all things through Him who gives me strength.
Try memorizing some scripture that you can say to yourself during the good and bad times of this journey we call life.