Well if you want to play with a more mature and good group your going to have to put in a bit more effort then just saying your gamertag.
I'm currently captain of the gears team in XGL, we're an over 18s clan established in 2002. Just click on the banner in my signiature, sign up and apply. I'll get back to you asap. Also a transfer window is opening this week so if you want to play sign up now