My sagging due to weight loss?

I'm 21. In 17 i lost my weight upto 9 kgs. so obviously my size reduced and started sagging. Bt nw i got increased in weight and gradually my size increased. bt still the sagging persists. mw it is difficult for me to dress with big bt viz sagging.. i feel ashame of my big sagging at this age as i'm not even married yet. Kindly suggest me a good.