Hello! Need some motivation! :)

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Hi! I've been on mfp for ages but I keep losing motivation and never taking anything seriously.. until now! I've just gotten to uni (I'm 19 really, don't know how to change the age on my profile!) and have gained about 6kg.. it doesn't sound like a lot but it has really ballooned my face and thighs out - all my family and friends back home have noticed and it has made me really depressed! I have three weeks until there is a huge party and until I go back home so I would really just like to get on track and have some lovely friends I can motivate/and that will motivate me back.. I say I want to lose weight then I turn around and reach for 2 chocolate bars!