MONEY
I would like to suggest that if money is a motivator walk away now! You will spend a hell of a lot on your training and it will take a long time to join the Gravy Plane (most pilot jobs earn rubbish money - at least in my part of the world. Too many, pilots too few jobs).
And like one of the first replies suggested, If you are only "interested," forget it. There has to be a passion. I had a passion like no other. All i ever had to do since i was six was fly. Now I have learned to fly (got CPL,IRT last month) the glamour has worn thin, i have a moderate debt (not quite a mortgage), and i am working as a builder's labourer because I don't have the experience to get a paying job. I may just be bitter. Interest Schminterest.