I sorta have to agree with @teenovision. You can do anything you set your mind do but we are born with certain talents that allow us to be better at some things than others. Our brains are slightly differently wired after all. Without talent, you're more likely to be less motivated, too. The less motivated you are, the less you practice. But even if you're not good at something and you practice the hell out of it to get better, you won't get as good as someone who has a 'talent' for that thing you're trying to excel at.
I sorta have to agree with @teenovision. You can do anything you set your mind do but we are born with certain talents that allow us to be better at some things than others. Our brains are slightly differently wired after all. Without talent, you're more likely to be less motivated, too. The less motivated you are, the less you practice. But even if you're not good at something and you practice the hell out of it to get better, you won't get as good as someone who has a 'talent' for that thing you're trying to excel at.
All I want to say is that drawing needs lot of patience, research and creativity it is not child's play