Modeling involves alot of self will these days, and just calling yourself a model doesn't mean you are one.
The hustle it takes to market yourself, get a good agent, get good work and get paid for a quality modeling job that makes you able to call yourself a model, takes more than just a cute face or being the right size or height. It takes will.
So if you are wondering why things are not working out for you, ask yourself,
"Are you really trying?
Are you trying in the right ways?
Are you modeling for real or just for the thought of it?