I am kind of short and I exercise all the time, but I am still fat? what do i need to do?

I do 100 sit ups and 100 push ups every 5 times a week and I use small weights to lift in my dads weight room. I eat a pop tart for breakfast, a sandwich for lunch, and for dinner i usually eat green beans with steak, deer meat, etc... I play outside a lot with my friends and do a lot of social activities