the most important lessons to learn:

1. only those who persist win

2. keep trying and throw away your negative feeling

3. stay away form the people you don't like

4. see people's value and do not alienate anyone because he is a threat to yourself

5. more openminded

6. be persistent, rationalize your time and balance your life

7. do not waste your time on regretting 

OK, 以上是目前为止血一般的教训中总结出的人生经验。