Hello! it's about 5 or 6 years ago i've masturbated too much and from that time i've noticed that my penis cant erect properly and if its erected i cant maintain erection. and my ejaculation pressure is almost finished and my sperms quantity very low?

Give it some rest. Masturbation per se does not have ill effects on health. If the symptoms persist, you should consult a urologist. 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!