Why on the hell am I short ?!!! My past

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Hi guys everyone here or almost are short we are all willing or searching for the same thing . But there is this question that is inside my head all day long , why am I short . Let's talk about my past ( growth spurt) , when I was a kid I was very fit ( 0 years to 12 or 13 years old ) . my predicted height for my first 10 years was 180 , 178 . But after that .... i became overweighted no sport and i came into food ( the bad ) . I ate a lot of candies ( fu**) and a lot at mc donald's very very often  . I was around 152 cm at 12 13 years old . I will put a pic of my growth pattern . And i finally finished at 170 ( fu**) . My mother was 5 ft and my dad 5ft 10-11 . Do you think that I could have lost all  these inches cause of the food or this is mostly genetic . 

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I am very very sad cause of that you know . I always thought  that i have lost some inches cause my predicted height is so different that my height right now. I did the opposite of what i should have done .

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I'm 19 by the way and i am turkish and french