Hate to be Compared!

Today i was not in the good mood..
The first day of 2008, everyone are so happy and celebrated for it..
but i was so moody..
i found that i couldn't communicate with Her..
talk a few words then we will be argued..
i hate that..
Actually i am so envy to my sister..
she can easily to communicate with Her..
why i am not?
for my friends they said i am talkative,
but i am curious why i am having communication problem?
Am i having dual personality?
i am not sure for it..
Another thing is, She likes to make the comparison on me with others..
For Her, i am always wrong..
and the outsiders was always be the right one!
What can i do so that she can feel proud?
Can somebody tell me?
i think only She will know the answer...
sigh..