Robert Herrick said, "Attempt the end, and never stand to doubt; nothing's so hard but search will find it out." 
Life is too short. Do not doubt yourself.

Whatever you want to do, do not be afraid to start small. Even if you are not getting it, that doesn't mean it will not work for you. It will work. Do not get discouraged. 

Good things take time to grow, to mature. Even when you do not see anything happening, do not give up. keep feeding your life, your soul. Keep nurturing your dreams. 

Do not forget that nothing is going to happen in your life unless you take action, unless you change, unless you nurture your dreams. 

You can't give up and expect to succeed. You can't give up and expect to win. It won't work. 

No matter how difficult, no matter where you are, do not give in to doubt. It will kill your dreams. 

Doubt is the beginning of failure. It is the beginning of internal defeat. It is also the beginning of external defeat. 

When you doubt yourself, you defeat yourself. You defeat your dreams. 

When you are doing something, do not focus on what is not going to work. Do not talk about what you think is not going to work. Because when you focus on problems, you will bring more problems into your life. 

Self-belief is better than self-doubt. Self-belief is stronger than self-doubt. 

If you want to succeed in your life, in your career, you have got to believe in yourself. When you do, doubt will disappear.