If you aren't at least 90% convinced that you are going to pretty much kick butt at law school or a legal career, what is the point?
OP, please explain what reality this belief is supposed to be based out of. Unless you've been reincarnated and went to law school and worked in the legal profession in a past life, this pig-headed confidence can only be based on a healthy ego developed by your mother telling you how wonderful you are.
Everyone else accepts that they cant predict their performance against a class of their intellectual peers, and plans accordingly.
ETA: an important part of your planned success will be a firm command of grammar. Thread title should be "am I the only person who believes in herself?"
My personal confidence is based on several factors. Two of my closest friends are current 2Ls who I spent a lot of time with and I have actually learned a pretty solid amount about what law school is really like from them. I read some of their exams, talk them through issues in their papers, and more recently end up being quizzed by them and their other LS friends about whether or not I have what they think it takes to succeed in law school. I also know a handful of very successful lawyers, spread out among several states, practice areas, and different law schools, who all know me very well and also think I will do well. Pretty much what I have been told and what I believe is that the biggest factor for my success is going to be how hard I am willing to work. I'm not an asshole or a narcissist, I don't automatically assume that I will be good at anything, I just happen to believe that I have a specific set of skills and interests that make it very likely that I will succeed in law school. I don't expect this to just happen magically, I know I will have to work very hard, but I believe that it is possible.
I just don't understand why someone would take on such a risk if they didn't have a reasonable expectation of success, and I don't see how someone could have that expectation if they are already viewing things like law review or top 10% as being nearly unattainable. I don't assume I will get them, but I at least believe I have a strong chance.