Must our achievements benefit others in order to make us truly happy?

Hi, [이름]! ^_^

Thanks for once again writing an essay. 
It is indeed nice to use our achievements to help others. 

We find more meaning to what we do and we discover our greater purpose in life which is to help others who are more in need.
Anyhow, I hope you\'re doing great at the moment. :)
See you later in class. ^^

~Teacher Charry  

I think our achievements must benefit others in order to make us truly happy.

>> CORRECT!
First af all, celebrities often volunteer to help others who need someone\'s help.

>> CORRECT!

What I mean is that many celebrities said after being popular and gainning lots of money, they felt empty.

>> CORRECT!

Therefore they started to volunteer to make themselves happy.

>> Therefore, they started to volunteer to make themselves happy.

Fianlly they said they could feel happy helping others and taking care of the people who need help. 

>> Finally, they said they could feel happy helping others and taking care of the people who need help. 
Also, everyone need somone\'s help someday.

>> Also, everyone would need somone\'s help someday.

For example, even though I am young and healthy enough to walk around, if a car hit me suddenly, I cannot do anything on my own.

>> For example, even though I am young and healthy enough to walk around, if a car hits me suddenly, I cannot do anything on my own.

Someone\'s should call 911 for me and take care of me at the hospital until I can walk alone.

>> Someone should call 911 for me and take care of me at the hospital until I can walk alone.

Nobody can live without someone\'s help and the help circulates around the world for everyone.

>> CORRECT! 
For these reasons, I think our achievements must benefit others in order to make us truly happy.

>> CORRECT!