Decision making

I hope you will help me to find errors in grammar as well as misused words, and which better way I can use to express my ideas?
Thanks a lot.

Should we make decision alone?

The notion of making decision alone is untenable and the one that I definitely don't rely on. A good decision needs a broad knowledge to make, while one person's ability is limited. In my opinion, a momentous decision, the one that could affect your life, deserves rigorous scrutiny of not just an individual but of many people.

The first and blatant advantage of not making decision alone is the more possibility that decision to succeed. This could be exemplified by my own experience. In Vietnam, students who attend to secondary schools need to decide whether science or art they will pursue. At first, I thought that science is tedious; my parents, however, realize the superior importance of science in contemporary society so they help me to change my perception. I finally to choose science as my major, and after a long process of study, I now could say that I will never regret because of that decision. I am in fact proud of it. Without others' help to make decision, I might choose the wrong way.

After a lot of decision making processes in life, no need to say, a lot of people could feel the burden while trying to decide something. Just the idea that wrong decision would ruin the one's future can make anyone of us hesitate to decide anything, and the veritable failure really comes, that fault will linger over one's mind forever. With others' help, everything will be different. The more people help us to decide, the fewer burdens we have.

Many important opportunities need expeditious decision. How long does it take for an individual to make a decision? Of course it's longer than the time of some people's work.
If one wants to be successful in this competitive world, he or she needs others' help to make not only a fast decision but also a good one. More people would accelerate the decision making process. I don't mean that individual's work is ineffective, but it's less expeditious in a prodigious number of cases.

The fact that we have been building this world together is a striking evident for the effectiveness of many people's work. With others help, the decision making process become not only effective but also faster as well.