body issues

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I'm looking for some advice/moral support :/ 
In 4 weeks time I'm going away with my boyfriends family, I get on really well with them and I'm really looking forward to it. Only issue is we're going to a beach resort so they'll be swimming and stuff going on.  I've always had issues with my body, especially my belly and legs and basically everything that will be on show on a beach 😂 I know I'll try to compare myself to other girls there and that'll just put me in a bad place for the holiday and I really want to enjoy it  
Does anyone have any tips or advice to help me have fun and forget about my body issues?