Parenting

I’m a single mother of a 12 year old boy and recently he told me he was gonna have some friends over, but he asked me if I could stay in my room while they hangout. After some arguing I did end up staying in my room for the most part outside of bringing them snacks/drinks. I was kind of hurt because I want to be that cool/friendly mom to my son’s friends and I want to get to know who my son is hanging out with. I’m definitely on the younger end for a mother of a 12 year old since I had him extremely early, so I feel like I’d be less embarrassing than other moms. Any time I’ve offered to chaperone for school events, he’s begged me not to. What should I do? Is this just a phase?