This kind of work doesn't happen over night. It takes a long, long time. And even after someone "makes it" they still get turned down for jobs. Sometimes it's related to politics, other times it's budgets and other times it's a style conflict. Perhaps someone else just matched their needs more than someone else.
You need thick skin for this industry. Thick skin for losing out on gigs and thicker skin once you get a gig and then have to work with negative feedback from a client. Just because you don't get a job now doesn't mean that connection you created is fruitless. I've been approached by producers/managers later after being turned down to work on their next project. So, keep your head up. Keep learning and keep striving. Also - when you do get turned down, don't take it personally. Be polite and professional. I often send a basic "Aw, bummer! I was looking forward to working with you! Hopefully next time - and best of luck on this project." kind of email. That is... if the client is polite enough to let me know I didn't get the job. If not, I just assume I missed out after a certain amount of time.
Best of luck man!