Proverbs 17:22 A joyful heart is good medicine.
One of the things about myself that I discovered years ago is that when I am feeling down, depressed, or sad, I can choose to act happy despite how I feel if I work at it. If I successfully act joyful, it is not very long before my emotions rise to the level of my behavior. There are many benefits to acting happy and then being happy despite circumstances. One is good health, at least better health than if you had remained sad or moody. Happy people have much better relationships than those who are down much of the time because they are enjoyable to be around. A result is that those with a merry heart lift those around them out of their despair and give them a merry heart. Another major blessing of choosing to be happy despite the lemons life has served you up is that you have more energy and your mind works better; at my age, those two are significant.
Some people will object to acting differently than you feel because it is being phony or hypocritical. Our motives, not our actions, determine phoniness. If my motive for acting differently than I feel is because it is the right thing to do because of the benefits to myself and others, then I am not being phony but wise.
Most people follow their flesh and emotions because it is easier and more natural. Jesus said, “Choose the hard way, not the easy way.” We are at a crossroads all day long: the easy or hard way. Dozens, maybe even hundreds of times, we must choose easy or hard. Train yourself to see the crossroads in everyday life, and then remind yourself of the words of Jesus. Memorize Matthew 7:13-14.