A collegue that leave the job by the end of the week invited me to a party she organized. I was surprised at first because I didn't feel like I was the closest dude she talked to at the office but apparently i'm the only one that she invited from the work.

I was quite happy at first and but now I remember that i'm not really good at parties. I'm stressed now because I'm afraid to make a fool of myself.

What can I do at a party to be cool ?