i played football for three years and never really had any fun,weight also has alot to do with genetics,i have extra weight on my stomach,large hips and thighs(thunda thighs )and the average extra body fat in other places,my grandfather,my father,and my brother all have the same thing and we also all live pretty diferent life styles.but i got lucky when it came to football,i'm 6'3 200 lb and i'm 15,i'm not all that fat either i'm only 20-25 lb over weight(well thats not skinny but i'm also 6'3 so it stretches out unlike my freind who weighs the same as me but is 5'7 and looks like chewed bubble gum but he's acctualy alot stronger than me) football isn't that fun to me,i'd rather get stonned and go mess around with freinds than be all sweaty and tierd.it would be fun if everyone on the team wasn't an egotistical asshole who's obsessed with how much they bench(and then can't even curl 35 lb) and the coaches are total asses who deserve to be beaten by a band of midgets weilding clip boards with play books on them.and well about your mum tell her how you feel.

good luck with everything and remember if you don't enjoy it and don't have fun doing it then don't do it.(unless it's something essential of course )