Need to lose weight fast!!?

I'm 14 and I'm going into 9th. I'm a bit overweight... I usually have a snack before bed. I skip lunch and I eat dinner.. But I'm still overweight. Not by much though. Maybe 10 pounds.. But I've got fat around my nipples so it looks like I have boobs.. But I'm a guy? I've Been told my body is saving fat for a growth spurt or my puberty process.. Help please! I also work out maybe 2ce a week.. Just sit ups and pushups. Please help