Recruiters, The Misunderstanding

Dear recruiter, headhunter,

I'd like you to help me to understand how you work…

...as I don't understand: why despite companies and clients say I'm very creative, I can't manage to have any appointments in your offices and meet any clients?
Why when I finally got one that it's only "one shot"? (means I was enough good for ONE company but not for any others?)
Why sometimes the recruiter interviewing me doesn't understand what exactly my job is? ("oh you are a multimedia designer?") .

I have some questions to ask you and it will be great if you could answer!