The world is full of casting calls, and you can rest assured that the people out there hustling every day and putting their feelers out everywhere possible looking for them are the ones that will be making it in the future. You may be trying hard, but you must eat, sleep, breathe, and exchange bodily fluids with casting calls in order to get yourself the exposure and opportunities that you need to make it out here.
The worst thing you can do is to sit back and rest thinking just because you have gone on a few casting calls this month you are really doing it and fame is just around the corner. No-one gets anywhere without struggling and striving until all their good clothes have ring around the collar. Except for people born very rich or into entertainment dynasty families who have casting calls for major roles just dumped in their laps all the time who never had to suffer or struggle for anything, but these people are in the minority and belong to a sub-class similar to that of royalty when it comes to their lifestyle and the kinds of privileges they enjoy in every aspect of their lives.
For this reason we do not compare ourselves with these people, or anyone else when it comes to how we search for, or how we conduct ourselves at casting calls. Professionalism balanced with a healthy dash of good humor, kindness, and humility will get you much further than wearing your sunglasses inside and acting like a diva when you're there on the same list to audition just like everybody else. A larger than life personality is one thing, but always remember your own humanity and that of those around you as well.