If you don't think you're any good, then make yourself improve. Diligently pursue it. Whenever you have free time, dedicate it to improving your skills.
Here.And when you can't practice online, do what I do and write it down on paper, so you can keep your ideas and build up on them with posterity.
How better to improve your skills than to write them down (or save them in a word document), so you can look back on them and see what you did well, and what you need to work on?
That's all I ever did, and it's worked for me since I was ten [10] (nearly eleven [11] years ago).
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)