Big plzz help me?

i have really big n they sagged a bit..am 18...am not fat a bit chubby am loosing weight now i do 70 crunches n skipping..its working on my weight...i am sliming down but my r very big i want it to be so big any one who looks at me they look at it its very very odd i am geting into dipression coz of this...is there any exercise so i can tone it...i cant get the oparation...so plzz tell me some exercise which would help plz plz plzzz :( :(