Had to give up my diet class :(

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I usually go every week and it has been working wonders on me but I have recently had to give it up because of money issues and I'm scared I will gain all the weight back on again :( Any tips on how to keep my motivation up so I can continue to lose weight for my trip to Lithuania in the summer? I've never wore a bikini in my life and I was hoping this would be the year. Fingers crossed!
Some new friends to help keep me motivated would be amazing.x