Here are 11 short and inspirational sentences in English that are full of confidence and motivation:

1、"Never underestimate the power of dreams and determination."

2、"Rise above the challenges and achieve greatness."

3、"Believe in yourself and your abilities."

4、"The hardest battles are fought within. Be brave, be strong."

5、"No dream is too big, no goal is unreachable with hard work and perseverance."

6、"Success is not final, failure is not fatal; it is the courage in overcoming that counts."

7、"Never let the fear of striking out keep you from playing the game." (Homer M. Hasvey)

8、"I believe that in all our efforts for personal fulfillment and inner development there lie immense capacities."

9、"Fortitude under hardships, hope in the end."

10、"In the darkest hour, comes the greatest clarity of vision."

11、"Persist in your goals and don't let anything stand in your way of success."

Each of these sentences encourages courage, confidence, and the belief that through hard work and determination, one can achieve any goal. Remember to always keep your head up, stay confident, and keep pushing towards your dreams!