they knew the individual would not stay alive and succeed without other people's assist.
I think using th actual word assistance would be better.
Nowadays some people think the youth spent most time for their own success or improvement, rather than helping their society.
the you spend most of their time for...
I do not support that idea;
put a period after this one an then start your next sentence.
I think if young people try to improve their livings, indirectly they improve their community.
I am not sure what you mean by livings. Do you mean living environment? this statement is unclear.
It may look like when the young people try to be successful, he is thinking only of himself rather than other people in his society; it can be correct, but indirectly they affect other people's lives by providing them with knowledge, new skills, and new industries
this sentence needs a little organization. It seems you are having touble expressing the thoughts clearly. You should start the sentence with Although it appears that when young people try to be successful, they are only thinking of themselves. get rid of other people in the society because you alreay mentioned that in the first paragraph as well as weather it's correct or not. Go on to mention However, they indirectly affect...then continue the thought.
the second part is great, but way too many examples, also you need to decide if you are going to use the generic examples, or the life expirece examples. perhaps you can use one of each..
Think of a doctor who wants to find a medication healing incurable illnesses to be famous all around the world; He would give health for millions of people.
For instance, I know a doctor who does not get any money from his patients once a week.
then go on to say how this helps the society.
I would say there are always bad and good people in the society. We cannot eliminate all of them from our societies, what we should do in training the youth to follow the right path. We all know that personal success lies under the society's success. Better community is not achievable without trying hard
this is a great conclusion