Mom guilt

Chelsea • FTM to a beautiful Baby Girl born 12/4/18

So my SO finally wore me down and we will be going out tomorrow night for NYE despite my hesitation to do so. His mom is going to watch out 3.5 week old so I know she will be in capable hands (she raised 4 kids of her own). My problem is I am having INTENSE mom guilt about leaving my daughter for the first time because I’m doing so to go to a party... I’m not a partier, bars aren’t my scene, and I don’t want to drink however those things are all ‘important’ to my SO. I just feel extremely guilty leaving my daughter so I can go spend time with her dad while he drinks and parties with his friends, part of me feels like I’m being an irresponsible mom and I just needed to vent that out. Does anyone else struggle with mom guilt like this?