If someone is giving you a place to stay, don't behave like a guest every single day. Wash the dishes, mop the floor, clean the bathroom, buy food once in a while. Contribute. Gratitude is shown through actions, not just "thank you."
Every man must meet his humbling phase in life, it’s better you meet your own quicker and when you’re young so you can get back on your feet than to meet it at the later stages of your life.