Dude im sure you know its horrible to be overweight, any tips how to lose weight fast what did you do? And how much weight can someone lose in 4months?

First off, my timing on responding to you is really shitty and I'm sorry. We're actually past the four months you mentioned and that's awful of me.
If you're still interested in my response, don't focus on losing weight "fast". Focus on losing it consistently. Dropping a pound a week for a year is easier and likely better for you than losing 50 pounds in 3 months, as long as you make proper lifestyle changes.