Do You HAVE To Do This At Baby Showers ?

I'm just wondering do you HAVE to open up the presents in front of everyone? My hubbys cousin's baby momma didn't . 
I was wondering if its a custom or is it a choice ? And do you just open the gift , show everyone , and say thank you or what ? I HATE being the center of attention šŸ˜’ <-- thats my main question in case anyone gets comfused . 
But id Also like to ask , in some races I guess they have games at baby showers I'm wondering what are the games that are played besides that drink apple juice out of a baby bottle . And does the mom have to participate? 

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