I heard this said the other day in response to someone who was very discouraged about their art, and couldn't agree more.
Nobody is born a great artist. Some people are more naturally inclined towards artistic things, it may be easier for some, but I believe that anyone can become a good artist if they're willing to put enough time, effort and practice into it through trial and error. It's a lot of hard work!
If you have a love for art, and never give up, you can do it. So don't give up. Always try your best.