Just play for having fun and ignore the score, that's what I do. I don't care about score at all and almost never look at my points while playing. Sometimes I get to put in my initials and that's when I look at what score I actually got.
Am I any good at pinball? No, not really, but I'm enjoying every second of my playtime and that's what matters to me. Score is irrelevant (I don't play in competitions either obviously).