Problems have to make you happy if you accept them

Problems make us happy. Why? Your brain rewards you with happiness when you solve problems. People avoid problems and then wonder why they are unhappy. To be happy in life, you have to solve problems. But solving problems usually causes more problems. There are positive and negative problems in life. The rich guy has problems buying a pool and the poor guy has problems not having anything to eat.

Example:

Your relationship is not going well because you can't spend much time with your partner. To solve this problem you need to set a day and go out with your partner that day. In order to stay happy in the long run you have to choose a day of the week on which you always go out with your partner. 

That means every Wednesday (for example) you have to organize a restaurant, have money every Wednesday and have time every Wednesday. That's a lot of problems at once but that makes problems into challenges and if you solve them you'll be very happy.

If you want more such tips for life, I recommend this book: