Please help , i want to get free from masturbation and porn addiction.

I am 26 year old Indian guy doing masturbation since i was 15 .
I got into watching porn 3-4 years back.
I was not much into sex education but loved masturbation as it gave pleasure .
I got to know today that the position in which i masturbated these years was lying opposite on bed faced towards pillow , so that i can rub penis with mattress,wall,bathroom floor and this is called prone masturbation(if i am not wrong) . I read in some posts that it can cause severe ED .

Sometimes i feel more tired nowadays.And some hairs are also becoming white .

I have not done sex till now(i am an introvert) , so don't know how i will perform during sex.( i am more worried on this part as my wife should get the amount of pleasure she desires ) .
I am worried on what would be the sperm count , semen and sperm quality .
Will my child be a normal child or not ?

I have only done 7 days but got relapsed and have not done any nofap days(30,60 90 and so on....) streaks,but i want to do it now . (Today is my first day).

I am not alcoholic (never drank any drink even one time ), no smoke but a little unhealthy lifestyle .

I do not exercise but planning to do, and i do yoga and totally believe in meditation practice .

Will not doing masturbation and doing exercise these many days will help me to improve the ED(if i would have any?)

Please help i want to be mentally and physically fit totally and do not want to effect my marriage life .