"…But I don’t have the right look!"
One thing I’m learning as I get more into modeling is that there isn’t really one set “look” that every model must conform to. Honestly, the most important thing isn’t really to look a certain way, but more so to own your own look. If you want to be a model but you think “oh, my nose is too long!” “my eyes are too close together!” “I’m too short!” “I’m too curvy!” “I’m too-” WHATEVER. Seriously, don’t sweat it. Each agency or casting director is looking for something different, and if you have a look that’s uniquely you, then it makes you irreplaceable. So the important thing is to keep in mind that it’s not “Can I be a model?” but “Where can I be a model?” If you submit to one place and they don’t take you, then don’t take it personally! It just means they were looking for something different. Keep submitting.
The important thing is learning your own personal strengths and weaknesses, and learning how to play off of them. It takes practice, like anything else. Also, research agencies to see the types of models they represent! Different agencies want different looks. It’s like publishing a book; if you wrote a romance novel, you’re not going to submit to an agent who represents horror novels.