I agree with RATTER.
You are not just pretty ... you also have an interesting face, which would appeal to photographers.
Don't be talked into "getting on the career ladder" or "getting a proper job". You have the rest of your life to do that.
Just remember ... modelling is hard work. It's not glamorous. It involves long hours, loads of travelling (sitting in traffic or on trains, not jetting around the world), and you will lose count of the number of auditions and castings that you go to before you get your first paid job. Sarah Doukas spotting Kate Moss in an airport loungs was a one off. That's not how it happens in real life.
Plus, you will have to spend your whole time working out and working on your skin (being made up all the yime absolutely shags your complexion!).
But, if you can cope with all that ... don't try to mentally plan out your life ... JFDI !!
(JFDI means "just f***ing do it")