You are responsible for your own happiness.

Don't expect "someone" or "something" to make you happy.  People and material things can contribute to your happiness, but only you can make yourself happy.  It is unfair to place the burden of your happiness on someone else's shoulders.   That's a heavy load for anyone to carry, which in itself can create a lot of unhappiness.  You also don't want people dictating when and if you are to be happy.  Take responsibility for your own happiness.  The happiness you get from things like, toys, clothes, cars, jewelry, etc., are fleeting. True happiness comes from within. If you can remember this, you will have found the "key" to happiness.