Yes, although I think I'm good about not letting it bother me for too long.
On Forum A, for example, it took me several months before I was able to make any friends. But even then, I felt my presence was often overlooked despite my consistent activity and socializing, and I had been excluded several times on a variety of different things by my fellow Stans.
On Forum B, for example, I've only been around for a few months, but was much luckier this time as someone invited me early on to have fun with their group. They've really taken a liking to me and have included me in many things thus far! I'm still a total nugu on the forum itself, though. Perhaps it will change in time...
And then my final example, here—K-Pop Source—I don't really know anyone yet and haven't made any new friends, but at least everyone has been nice! So, I'm optimistic. Same goes for Forum B, though; I'm hoping the more I contribute and what not, the more likely it will be that I'll be noticed. Not to put the pressure on anyone else, exactly! I know I could reach other to others, too... You know what I mean, though?