Losing weight requires exercise and a healthy diet; there is no way around it. Start by getting rid of all the junk food you have and replacing it with healthy fruits and lots of vegetables. Avoid fast foods and stick to healthy fruit or vegetable snacks when you feel like snacking. Make sure you burn more than you eat and drink lots of water. See www.webmd.com/diet/guide/lose-weight-fast-how-to-do-it-safely for details.
Basically burn more calories then you in take. So lets say you ate 2000 calories that day, you have to first burn those 2,000 calories. Also maybe try out this thing called Green Coffee Bean Extract it was on doctor oz it's very good for losing weight.