This I have heard so many times, both echoing from my own vocals and from that of a friend or just someone I'm having a casual chat with. Don't we all pursue this most (if not all) of our lives?This I can tell you, the one thing that my life and all the roller-coaster rides that came with it has taught me is the everything in life is only a choice away. Yes you'll probably will have to make that choice on a constant basis to get the lasting effect but it is nothing more than that.
If you go to a motivational seminar and choose to feel better afterwards you will do so until you choose to feel like down again. If you wake up in the morning and make a choice to feel good you will until you choose otherwise. Take this scenario: Two guys both from tough backgrounds and that had lots of issues growing up both get dumped by their girlfriends who is the love of their lives. The one crawl into a hole and think about suicide and revert to being constantly drunk to "handle" the pain and the other one carries on with his life and although it hurts he bounces back and take life on and start living a normal and happy life.
Why does this same situation have different outcomes? Choices! We either choose to be depressed or choose to be happy. To choose to be happy doesn't mean we make that decision and it is permanent, no, we have to make that decision everytime something bad happens, a memory arises or you see something that triggers emotions. This is a process of interlinked choices that make us who we are.
I am not saying it is a walk in the park, all I am saying is that it is possible. So why can't you be happy? Because you haven't begun the process of making a decision to do so. Just try it, start with something simple, say to yourself that tomorrow you will get out of bed and not dread the day ahead. Then if you feel different during the course of the day look back and check when/where you decided to feel different.
Once you get into the mindset of making these kind of decisions start tackling the bigger issues in your life and you will not believe the difference you will see.

