Will this diet plan work?!

I've just decided to lose weight. I went through a personal tragedy that well derailed my life. I want get my life back...being 17 and 257 pounds isnt apart of that equation. I look at one of those bmi calculators and it scared the **** out of me. I've decided to stop drinking pop and cut out basically all meat. Instead of walking....i'm gonna dance for 45 minutes. In fact the only the things i have eaten today are 2 glasses of water, some sausages and hashbrowns dipped in jelly. Do you think this diet will work? How much weight can i lose by june? Thanks and xoxo