Getting Jealous of His Friends??

So I don’t have many friends (especially not many that are free to hang out) because I’m homeschooled. So I really only hang out with friends once every 3 months or so, which I’m a natural introvert so it’s fine. However, my boyfriend has lots of friends that live close and he hangs out with them 2-3 times a week. Although he does spend lots of time with me, I get so jealous when he hangs out with his friends. It’s gotten to the point where I’m jealous even if he’s hanging out with them at a time when I’m not allowed to be out with him anyway. I know it’s bad, and I know I’m too attached but I really want to get out of this habit of being jealous and so attached to my boyfriend! Does anyone have any suggestions for me??