Baby shower Etiquette, HELP!!

Okay everyone I'm a first time mom 19 years old and my baby shower is coming up soon! I'm a very nervous person in general so I'm really starting to stress over my baby shower, I have never been to a baby shower before and I have absolutely no idea how to act, especially because it's none of my family it's all my boyfriends family most of them I have only met once and others I've never met at all ( there will be 50+ people)😖 so my question is how do I act when opening gifts do I say thank you to every person after I open their gift or say thank you to everyone at once at the end of the shower?? Ugh someone please give me some tips on how I should act and how to be polite and basics of a baby shower, I'm so lost and nervous and I don't want to come across rude because I'm not I just don't know how to act around large amounts of people especially when the center of attention is me! Omgg😖😁😭 

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