I always wanted to be a model because of my natural good looks.

Hi, There are good career prospects for models nowadays. It is a career that does not have definite age or eligibility criteria so you can commence right away.  
However, notwithstanding your natural capabilities, you must be prepared for hard work, high competition, and constant meetings/cancellations. That said, the following is the recommended path:

1. Decide your preference and area of expertise – whether it is print modelling, TV advertisements, online commercials, or even ramp modelling. This will help you focus and get better initial assignments.

2. Get an impressive and comprehensive portfolio developed by a professional photographer or publishing house.
3. Enroll in a well-known modelling school to further develop aspects related to personality, body language, expressions, and walk.
4. Approach established modelling agencies and media producers through reliable online and offline sources.             
Good luck!