Overall, you have a good chance of getting into Stanford. However, there are many factors that are beyond your control. The number of applicants to Stanford has been increasing steadily over the past few years and the acceptance rate has been declining. This means that the competition is getting more and more intense. Even if you have a strong application, there is no guarantee that you will be admitted.
If you are not admitted to Stanford, don’t be discouraged. There are many other excellent universities out there. Remember that college is just one part of your life.