can't succeed

for the past couple of months iv bee messin around with my guitar and makin up stuff and rarly, ill play somethin that i really like and ill make it into a song. but whats a song with out words? i try over and over again to wright down what i feel or think but it always come out crappy. and i get pissed off because i cant write meaningful words to this melody thats in my head.you would think that if i could make music then i could write some lyrics to my song. but it never works out the way i want it. it either sounds really dumb or the words dont really fit right. and some times i get wrighters block. i cant even think what to wright about. i dont have a muse and i feel stuck between a rock and a hard place. but if at first you dont succeed try try again, right?