We are all responsible for our own lives and our own happiness.
Our feelings? Our responsibility.
Our actions? Our responsibility.
Our reactions to what happens to us? Our responsibility.
At first it may feel overwhelming or scary to realize that we are the only ones responsible for our lives, that no one is coming to save us when we get ourselves in tough situations, but ultimately it's incredibly empowering.
Something bad happened? That sucks, but it's on YOU to decide what you do after. And you can do whatever the heck you want.
Stuck at a job you hate? No you're not, you can choose to find something else.
Stuck in a bad relationship? No you're not, you're choosing to stay. Choose to leave, or work on it, or whatever you want.
Ultimately, your happiness is in your hands and yours alone, and that means you have complete control over it.