Is it normal that my cum load is small and almost have no energy to do sex twice in a row?

If you produce 2.0ml or so, it is normal. Most men need a 24-hour turnaround 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 and Covid vaccines. Wish you good health!

Volume of ejaculate is affected by several factors, the most common being frequency of orgasm. Most men have a refractory period between orgasms before being able to experience another in succession