You control your state of Mind ​

Because you are not of this world you control your state of mind. 

Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.(Romans 12:2 ESV)

You can choose to have fun, be Free, relax and meditate, take a walk out in the sun, speak using positive words, laugh, smile, have a heart of love, give back to people and God.