以下是一些勉勵自己的英文短句：
1. Never give up, never surrender.
2. Keep going, never back down.
3. Believe in yourself and you can achieve anything.
4. Never let your failures defeat you, keep trying.
5. Success is not final, failure is not fatal. Keep hoping, keep fighting.
6. Don't let your past determine your future.
7. Learn from your mistakes and move on.
8. There is no better time than now to achieve your goals.
9. Success is not a destination, but a journey. Keep pushing forward.
10. Believe in yourself and your abilities, you can do it!