Regular paps age 23 "inconclusive" but all follow ups since ok. Pap every 12-18 months recent pap (no HPV testing) age 40 ascus. Rec repeat pap in six months. Worried now. Does this mean cancer?

The opposite. It means the opposite of cancer. These results should lead you to relax not worry. If you had cancer there would be progression. There would be definitive changes that are diagnosable. Ascus, even persistent, is something you can relax about. Cancer does not stay stable or unchanged.
Not at all. You do not have any good reasons to worry. This type of pap-cytology report is common, it is benign and does not require anything more than regular follow ups and pap tests as advised by your gynecologist. This is not cancer and it is not even pre-cancer.