Along with what TrollHeart said(ever hear of Bernie Taupin) I'd also point out that no-one, no matter how famous or revered for their talent, starts out as great lyricist, they get that way through practice and studying others work. If you want to become a good writer you need to write all the time, even if what comes out is horrible, eventually it won't be. Also find lyrics and poems you like and study them-don't just read, but examine how the words are used, how their sentences are structured, and how lyrics are fit to the music they're paired with. Eventually you'll start to be proud of what you are writing and get the confidence to try and find musicians to work with.
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