Everybody has potential, but it can take some serious hard work to bring it out.
The main thing that I noticed about your post was how you were looking at the game. You can't think about 8 ball in terms of an ongoing score card, it will seriously hinder your progress at the game. It doesn't matter in the slightest how many balls are left on the table at the end of the game, you won or you lost, that's what matters. If I don't think I can run out the table my first turn, I won't even consider making more then 3 or at the most, 4 balls. I'll make a ball or 2 to get position so I can try to break out a problem (or create one if I think my opponent might run out) and then walk away from the table with the cue ball in as bad a spot as I can find.
The most important thing anyone ever taught me about 8 ball was, just because you can make a ball, doesn't mean you should make a ball.
Or put another way. Making a ball doesn't always get you closer to winning the game and can sometimes make it almost impossible to win.
Improve your shot making and postion play and stop thinking about 8 ball in degrees of wins or losses and you will be well on your way, good luck.