HOW MANY POUNDS CAN I LOSE IN 8 WEEKS? 10 points?

I Really want to lose between 24-30 pounds, I started my diet today & it was horrible:( but I going to do better tomorrow, I'm now at 216 pounds & 5'6 or 5'7, I'm OBESE & I want to be at 180-190 before august 15, & then I'll slow down the weight loss pace, I'm playing golf,tennis & soccer & I'm also trying to lose this weight for a wedding in September. & I was wondering can i lose 3-4 pounds a week since I'm obese & overweight ? I jog on the treadmill, elliptical & stair master machine 4-5 days a week & walk for 30 mins-1 hr on the weekend & when I'm working out my calorie intake will be 1500-1800 & when I'm NOT It'll be 1200-1400.......... && NOOO I'm not trying to be like 100-120 pounds like these crazy teenager girls out here, I just want to be at 160 pounds again (: thanks