Jayelleseven
I would say that if you want to become a professional pilot then try speaking to someone at your local flying club or flying school.
Just turn up and see if there are any commercial pilots around or anyone that can put you in touch with an airline pilot. Speaking direct to someone over the phone is a good way to get some of your questions answered. Most pilots would be happy to spare you sometime as each of them started out with the same questions you are now asking. It's difficult for me to advise you on avaition as a career as there are lots of things to consider. The only advice I would say is speak to some airline pilots directly, look at your finances as it can be very expensive, and decide. Save your money and go for a trial lesson in a light aircraft to see if you like it.
What ever you decide to do, whether it is an aviation job or something else, if you put in the work you will be acheive your goal and don't let anyone tell you it's not possible.