New to this site..not to the diet thing...

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im new to this site but not to the diet thing..for a while now i have been going off and on diets..but cant really stik ton one..after i had my daughter i blew up more..now i am ready to get rid of it...SERIOUSLY..we have a beach trip comin up..im tired of going to the beach and hidin under a tshirt..i wanna be able to go and have a good time with my family and not worry about being big...i jus wanna be healthier..it would be great to have some people to talk to to help me get through this.. by the way my name is melisa and im 21