A Frustrated new girl!!!

First off I wanna say My name is Kayla, and about 2 summers ago this website helped me lose 40 pounds. It was amazing I started to love myself more i gained more confidence in myself and i just felt like an all around better person. i am still in the 200 pound range however and my dream is to be back in the 100s, 150, 140 pounds to be exact. Last like i checked i was 213 pounds. I am a senior in high school getting ready to start a new phase in my life. I want desperately to lose this extra weight. I'm really frustrated cause im at a period where im losing it a little then ill gain it back, ill start eating right and excising then due to stress ill give up and wind up gaining it back. I wanna start and lose it for good. I really hope that this will help me like it has before. I would love to make some friends who can share this experience with me give me advice and keep me motivated to succeed. Thanks so much for reading. Good luck on your journeys as well and i really hoped you'd be interested in joining me for mine.