Wonder shy you get angry so easily （66）w your friend smiles all the time？It's probably because you two have different personalities．
Personality （性格） is about （67）h people think，behave，and react（反应） in different （68）s ．So what （69）m people think，behave and react in certain ways？
Part of the reason is that people are （70）b like this．A baby gets its blood type，genes，and （71）o physical things when it's still inside its mother．These things may help decide what the baby will be like．
But one's personality doesn't stop here．Family life，school learning and life （72）e can also make you the person you are．This doesn't （73）m it's impossible to change your personality．You can always try to make yourself （74）b ．Don't get too worried about your shortcoming （缺点）．Just accept them．This is a good way to start making changes．
For example，if you don't know how to make friends，find （75）o the reason．Is it because you're too shy？Tell yourself to smile at people．Start talking to people using （76）w greetings．
However，it's not easy to change lifelong habits in one night．Don't give yourself a hard time．Keep （77）w at it．One day you'll see that you can turn over a new leaf and be a new you．