Super Llama
Aussie Poké Trainer
The opportunity to make yourself happy is what you stumble upon.
Happiness is certainly easier to come by if your environmental conditions are favourable, and those conditions are coincidental. For example, being born into a loving family, whose members live to a ripe old age; chancing upon an attractive mate with common ideals and mutual affection; receiving a monetary windfall.
That being said, your own actions can help to bring a family together, you can work hard to improve yourself and be more benevolent friend and partner, and you can strive hard to earn the money that lets you fulfil your material ambitions and allow you to have inspiring experiences.
And I think that when you strive for happiness, though the journey is harder, that happiness is ultimately deeper and more complete.