a bad experience is an experience as well. you can learn from your mistakes and situations you were not happy about.
a bad experience is nothing but （只不过）an encyclopedia(百科全书), which enriches our lives (丰富生活), widens our horizons （开阔眼界）and enables us to realize how to avoid the same situation when you face it again.
never can you imagine how upset i was when i failed the senior high school entrance examination. all my pride was defeated and i even thought of giving up myself. it was my parents who encouraged me not to lose heart and do better in the future. then i forced myself to concentrate on study during that holiday, thus making（结果状语） me do a good job in the first exam in high school. after that, i became much more confident about myself and made much progress.
a bad experience is really terrible, which would puzzle a person at a time. but if you learn from your mistakes, you will absolutely(绝对) benefit from them a lot. had i given in to failure, i would differ from what i am today.（要是我向失败低头，我决不是今天的样子） .we are supposed to （＝should）take a positive attitude towards a bad situation, and only if we learn from it can we do better in the future.