OMFG I GAINED WEIGHT NOW I NEED TO LOOSE IT HELP HELP HELP?

okay, my legs have gone fatter and how do i loose it? gym not an option coz the gym thats next to me is closed for renovation and the other gyms are like 20 ks away. and i need to loose weight on my stomach and face and yeah. oh and also, any ideas as to how not to eat lunch at school or have like an apple only but not get your friends to realise coz my friends shove food down my throwt (idk how to spell that) when they find out im on a diet?? like i will eat at school, im too fatty not to eat lol but my friends refuse to let me diet :( so yeah how to loose weight? please help? and how to eat less at school? thanks guys so much :))))