Weight

Hey, I’m 13 and my parents are separated so I love in Pau and my father lives in Houston so I don’t see him that often but every time I see him he always says something about my weight and because of this I have had problems with my self esteem before but he keeps saying that I have gained weight and that I need to get skinny again I’m 1meter 60 and I weigh 45kg is that too much ?