Masturbation and sperm count

hi all,

I am 26 yrs old now.. i used to mastrubate from my 10th std.. (not sure how many times i did) .. evrytime i do i feel comfortable and happy. but for past 3 months, once i complete the mastrubation i feel tired, pain in knees.. i know these are the side effects .. so i reduced doing it (may be once in a week)..

now i have decided not do it again in my life.. i am worried whether this will effect my sex life with my future partner... whether there will be any decrease in sperm count and whether i will not be fit enough to produce a child... 

please guide me since my marriage can be fixed in any moment