Responsibility is not a 4-letter word
Whether you like it or not, your actions have consequences. If you try to avoid responsibility, what you are really trying to do is avoid the consequences of your actions. Which doesn’t ever work. There will always be consequences. Once you realize you can’t avoid the consequences, you begin to realize how important it is to choose your actions wisely.
And there you have it. The big secret of the Humanist approach to happiness is to take responsibility for your life. This isn’t something someone else can do for you. Trying to avoid responsibility never works out well anyway. So, if you want to be happy, embrace your responsibilities.