If you don't believe in yourself, you will not have the motivation to follow your dreams nor to take care of your body.
Believing in yourself can be hard, but you are capable of turning the negative into positive. Have you noticed that when you have negative thoughts, you feel like everything goes wrong!? Studies show that optimism and pessimism can affect your health and well-being.
So, from now on don't let negative emotions affect your life and health! You are in this world for a reason! Remember, you can not take care of others if you don't take care of yourself first.