Well personally... I never intented to write anything but when the inspiration came I couldn't help but pick up that pen and start filling pages and pages. (ps. I don't write lyrics but fanfictions)...Maybe you should just wait to be inspired. I deem people's stories,lyrics,poems etc are way better when they were written cause of inspiration and not because someone had to write something. If you say you've been trying for years but still you can't maybe that's not the right path of art for you. If you can't write lyrics, you could start with stories which I find easier! You just have to find that something in your life that inspires you!

well I've been working at that for a while too. I finally have a good song now and I'm gunna tell ya how it happened. I thought and tried and failed many times. then I tried just poetry and I did some from many different styles until I became very good. then I started focusing more on things like iambic pentameter (which is present in many songs) and things like that. I worked on making each line have a specific number of sylables and made line one in my first stanza have the same number as line one in all the other stanzas. I did the same thing with every line. I worked on my vocabulary and tried to make the words interesting. then I tried ballads, and, with practice and constructive critisism, I finally succeeded.