What are the odds of contracting a disease like hiv or hsv if you grabbed a used uncapped razor that was on the sink from the top i touched it with my thumb and index finger?

There may be a greater risk of getting struck by lightning than catching HIV of HSV 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 and Covid vaccines. Wish you good health!