You have to concentrate on what you CAN do. I don't play the guitar very well and like you, practice hasn't helped a whole lot. But I can sing (I think), so I do that the best that I can. There's others who can play very well but don't sing too good so they stick with just playing.

There's room for all of us. Keep doing what you ARE good at and maybe the other stuff will improve with time.

Bert.