New to this website yo-yo ing back!

Hi all! Just want to say Hi and that I'm looking for friends to encourage me on this website. I have previously went from 147 lbs to 110.. through logging on another website, beachbody videos, WW, dancing, counting calories, I have tried it all. I got comfortable and the weight has slowly crept back within about 4 years.. Now I'm back to 150, and I feel like it is so much harder to get the motivation and results this time around. I want to get my bikini bod back in time for my wedding in September!
I'm starting a 21 day fat flush challenge on Monday through a work program as a beta tester. I'm lucky to have a gym here (that I have yet to use) I'm nervous and excited for the results!