Youngblood hit it right when he told you about getting through the gym doors and doing it.
From there, it depends on you, how good your trainers are, and so many variables.
Like playing a piano. some people are terrible, some play fair, some play good, but there is always that one in thousands, who just can put it all together, hone his talent, and become great.
The challenge is for you to see if you can do that.