Is waking up every day a chore? Is it hard to get out of bed? Is what you do every day worthwhile? If you don't like the answers, you may not be pursuing your passion in life.
Take a moment and think about what you would like to do today if you had unlimited time and money. That is your true passion. If you are not pursuing it, you are always going to have that nagging feeling that you are trapped.
If you are a paint, paint. If you are a singer, sing. If you are a writer, write. Even if your current job or activities limit you, make time each week to focus on your passion. Watch what happens as you discover and pursue your passion.