I really want to be skinny! I want to wear a bikini!?

Ok, so Im 12 and I weigh 130 pounds. Im 5' 4". I can suck my stoumache in pretty far. But I really want to wear a two peice swimming suit to impress my best friend (a guy) that I really like and go to the lake with. I want too buy a Roxy swim suit to wear. Im always wearing a one peice or a swimming shirt and boardshorts. Is there any way I can become really skinny by swimsuit season?? Thank you to anyone who answers!