This is where I started. Years ago, I was in a place of personal hell, until I set the intent to become happy and at peace with myself and life. It didn't happen over night, but I can tell you that it would never have happened if I didn't set the intent.
Evaluate the way you have been thinking. Do you believe that you will never be happy? Do you concentrate on why you are not happy? These thoughts will only reinforce your unhappy mindset.
Take the first step- plant the seed, "I live a life of joy and peace." Repeat this as often as necessary and one day you will realize that you do indeed live a life of happiness. Remember to be patient with your progress. A flower doesn't grow in one day. But it will never grow if you don't plant the seed.