Many years ago I left Graduate School in an un-related field and was working in the retail fashion industry. After having trouble making ends meet I decided to get into the financial business (I made the decision while sitting on the sidewalk after a motorcycle accident). I began emailing, faxing, and mailing my resume (without anything remotely financial on it) to various firms.
One day it dawned on me that this was ridiculous, that I'd never get a job in this industry this way. I put on my suit and hit the pavement. I showed up un-announced, resume in hand, and requested to speak to the most senior person in whatever office I went to. Everyone I encountered thought I was nuts.
Until one day, on a normal Thursday afternoon I was in the right place at the right time. The Managing Director came out to meet me (apparently there was a mis-communication and the MD thought I was someone important or an appointment that they were expecting). The MD looked at me and said, "You know people really don't do it this way. Most people don't show up like this". Almost without consciously aware of it I replied, "With all due respect, that's the problem with most people - they don't show up".
The MD was shocked, then looked at me from head to toe in what appeared to be anger and disgust. Then they said, "Okay, come into my office let's talk". I knew at that moment I had it. We hit it off. It took another 3 months of constant interviewing because the MD did not know what to do with me, I believe they struggled on whether to hire me or not. It was all very un-orthodox to say the least. The MD essentially worked with HR and directed them to have me meet and interview with specific people (all higher-ups) to get 2nd opinions and feedback. I got a call late one night from that MD on their cell phone and they made an offer. The rest is history.
Don't ever let people tell you what you can or cannot do. Show up. Show up in the biggest and best way that you can. Be yourself. Work harder than your peers. Visualize where you are going and eventually it becomes reality. Go set monumental goals for yourself and then work backwards to find out what you need to do on a daily basis to achieve greatness. What are you waiting for? Go do it.