So I recently met my boyfriend's friends, who are a tight-knit circle of couples that met at roughly the same time (studying abroad). There's a fair age difference between us (they're about three years older), and I doubt that we have much in common experience-wise. The one time I saw them, they didn't pay me much attention either way, and I had to leave early.

I know I'm not the most charismatic person ever, and it's fairly easy to forget about me no matter what I do. If and when I see them again, is there anything I can do to put us on common ground? Because while I do enjoy spending alone time with the boyfriend, I'd also like to get out with a group.

tl;dr: do I have a chance with his friends?

Why don't you ask your boyfriend about this? There's a chance he might know them better than we do.

The more you're around, the more they'll get used to you, and the more chances you'll have to be noticed or talk to them.

They're close knit, the first couple of times you meet them you can't really expect to get too close, don't worry about it and as said above, if it's really getting to you, ask your boyfriend about it.