Is it kind of weird I'm lowkey jealous of my 12-year-old son?
Why are you jealous of your son?
Mostly because I don't have my own life. Most of my free time is spent with him.
You should find a way to meet people and have your own life.   You should not be angry with your son and take it out on them or that could lead to a rift in your relationship down the road.
I'm just a little bit frustrated with his behavior. I'm trying to find a way to spend less time with him.
Yes, it would be healthier for both of you if you both find people to hang out with separately. You will maintain your sanity and he will become better at social relationships.