lose 60 pounds in 6 months

I have a job that i work 16-24 hours a week at. I am trying to ger ready for college. And everything is so stressful. I have tried to lose weight for 2 years now. I was on birth control and I gained weight but it seems so hard to lose weight. I exercise when i can and i dont eat fatty foods but i still keep gaining weight.

I am 17. I weigh 170 pounds and i am 5 ft 6 in. In 6 months I am going to my brothers wedding and visit my boyfriend. My boyfriend is in the military and he is stationed somewher else. My whole life i got teased and when i go back there i wanna show people i can look good too.