50 pounds in 40 days!

So, hello guys!
This is my 1st post here.
Tomorrow I'm starting my 40-day fasting challenge. My boyfriend's coming in 40 days and I need to look good for him!
I'm very overweight. :( (around 180 pounds, 5.5 inches)
I'll exercise daily and I'll take vitamins and some other stuff like juices and coffee for energy.
I'm starting tomorrow and I'll be strict as hell. My goal weight is 130 pounds! Do you think that I'm able to do it and lose so much weight? Thank you indeed, I'd really like to read your comments, advises and other stuff that will help me!
xoxo
p.s
please, don't tell me that it's unhealthy and some other bullshit like that, i know that but you're not gonna change my mind, you're actually not going to tell me something that i don't know!!