I've unknowingly used my deodorant 8 months beyond its expiration, am i not at risk? should i still use it?

The "use by " date on such products are suggestions not a time when they go bad. It implies that potency & effectiveness cannot be assured beyond that date. It does not mean it turns toxic. If you find it is still adequate for your needs use it until its gone. If the idea bothers you throw it out.

There is no risk to your health from what you described. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV, Flu and Covid vaccines. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines