Hi Dorrie. Don't give up. For cutting accuracy, I go to the $1 store and buy the rubberized shelf liner. You get a ton of it and cut a small piece to put under your ruler. Lay it between the ruler and fabric. The ruler doesn't move and you get nice accurate cut. Don't be upset if you cut the piece of the of shelving because you have a whole roll of it!
If you love quilting, just enjoy yourself. My quilt tops are far from perfect, but that's ok, too. You are being really hard yourself. Try to be forgiving.
Good luck,
Susan