Does Frequent Masturbation Cause Less Semen And Pain In Testes?

hello.i am 18 years old.i use to masturbate for 7 years. i dont even know what i was doing then. it became a habit to me for every 4-5 days. now i am getting less semen and some times pain in my testes. my dick also looks cross sometimes. will i be perfect in my future marital life?what should i do? is it wrong what i am doing? i feel guilty many times. help me please.