You must, regardless to what business or industry you have chosen, take massive intelligent action towards your outcome. Chances are high that someone else has done it already. Don't re-invent the wheel. Tony Robbins would say that you should also model their beliefs, not just their actions, if you can find that out.
Failure is part of the main formula for success.
I've screwed up more in the last 7 years, than anyone I know. That is not to say that you should fail on purpose and that is good, but rather that you should expect to screw up and then learn from it, and to not repeat your mistakes. Write, Author something, Publish or perish. You get instant credibility, which is something you desperately need in your 20's, and you will force yourself to learn your industry inside out. Find a series of mentors who will guide you.