It's not embarrassing at all.
Online forums are just a way to connect with people who have the same interests as you.
There are full-grown adults on sports, tv, movies, gaming, etc forums online.
It's nothing embarrassing, childish or immature, depending on how you use it.
Not at all. When I'm in class waiting for our professor to show up or if I finish something we were assigned to do in class, I sometimes get on ATRL right then and there.. I honestly don't care, I mean, what's so embarrassing about it? The fact that it's an online forum?