Every time i drink coffee i feel too anxious and hyperactive, but without coffee i'm tired and i can't concentrate on what i must do. is there something that i can take instead of coffe in order less tired? (i already sleep 8 hours each night?

These symptoms are likely dose related, which means the more you drink the more intense the stimulant effect. You can reduce the volume, or switch to a lower caffeine load like that in green tea.

You could try taking tea rather than coffee. Or you may reduce the amount of coffee you drink at a give time. 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!