<human>: I (17m) want to my girlfriend (17) to go with my parents and I to see family and celebrate Christmas on Christmas eve and then come back Christmas day. (We have been together for a year and a half now)

We did this last year but now she isn't allowed to go with my this year because I didn't go to her dinner with her family on Christmas night. 

I've messed up on several occasions now on not going to her family get together. My reasoning , I either can't remember why I didn't or it doesn't really matter at this point because it was a mistake. 

My girlfriend said that if I wanted to I could try and talk to her parents about it. But for one, I am not very comfortable around her parents and two, I don't even know what I would say.  

I have already said that I was planning to go to her family dinner this year and that didn't really have any effect on the matter. 

I really want her to go with me and see all of my family again but I don't know how to handle the situation. Just thinking about talking to her parents about it makes me nervous. 

I know I need to just man up and try and talk to them but I just don't really know. 

Help would be very nice. Thank you for your time.

Can you summarize the given text in a few sentences?
<bot>: want my girlfriend to go with me to see family but she isn't allowed because I messed up and didn't go to her family events.