1. Follow your heart
2. Earn a BFA in Photography at the best university you can affort/get in to
3. Peruse your passion with passion...
4. Be creative - perhaps teach photography yourself, work at a museum... that is, immerse yourself with other revenue opportunities based on your skill. Many a musician have made enough to live on playing in wedding bands on the weekends, teaching music, writing, and working in a music store. Photographers, same.
5. Is your goal to make a lot money or be a photographer? Would you be only happy being rich as a photographer? - That may be unrealistic. Would you be able to live an auster life - maybe no cable tv, no air conditioning in the house, old car/no car, buy clothes in thrift shops, survive on Ramen Noodles or rice and beans, live with roommates in an apt - indefinitely, and be happy as long as you're doing what you love?
6. Will you regret it the rest of your life if you don't give it a shot? Many an accountant who went to university with a desire to do "something else" but were pressured to major in "something they'll get a job in" go balls to the wall later to pursue their passion, or don't and regret it every day of their lives. The pharmeceutical industry loves those people, as they account for a high percentage of their SSRI sales. Often, that "safe job" as an accountant results in a rude awakening when their company is bought out and their job is deemed redundant. - Not so safe after all.
7. A famous, talented photographer (or author, or artist, what have you) from your generation will certainly emerge. At this point, you have as much a shot as this person. Why can't that person be you?
Follow your heart - fearlessly