It seems as though you have thought this through. That's the hardest part. You will get through this, and just keep focusing on the positives and what you have to look forward too (such as college, career). You'll be okay. There are so many wonderful women on this site that have gone through this that I am sure you will get to know and if you have a bad day after it, they will help you.
Its not going to be easy, but if you have your mind set on doing this then there is no turning back. This is something you will live with for the rest of your life. I wish you the best and may god bless you.