Lol Layla i been at a SDA church 15 Years of my life... I just started exploring this year and more specifically from June
You ever go to Berean? My friend plays the organ over there. I owe him a visit really soon.
If you're looking for another Sabbatarian church with a more pentecostal flavor, I know of a couple. Powerhouse of Deliverance (The Pace Sisters' brother's church) and New Bethel, which is a Hebrew Pentecostal church. One is on the south side and the other is in Decatur. If you want a church with a strong youth ministry, I can send you to my friends at Rhema.
There are too many churches in Atlanta for you to be wandering around like that at your age. You're too young for that. Seriously. Pray about it.