25 is too young to feel this f-ing old

My birthday is in two weeks-ish. I will be 25 and my diet is no where is sight. Mike and I are "talking" about getting married at the end of 2011- or the be more exact-19 months from my 25th birthday. Have no idea what weight is- would guess 350 and growing- but I would like to actually find a wedding dress this time around- and that requires some action. To go from 350 to 200 in 19 months is 7.8 lbs a month- or roughtly 2 lbs a week- pretty girl at a pretty wedding- like I know how to plan one of those- and hopefullyby my 28th birthday we can start trying- likr for real. I am too unhealthy and too fat to go on this way...I want to live to see 38